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教材资料◆初中英语知识归纳总结大全(打印版三) 第二十一课时动词时态的一致 教学重点 时态的一致 时态的一致主要是指在主从复合句中,主句与从句之间的时态一致通常主句的时态决定从句的时态。原则是:当主句是现在时与将来时,从句的谓语根据具体情况可以使用任何时态。但是,当主句谓语使用过去时,从句必须使用过去时态。如下表: 教学难点 1、宾语从句和间接引语与主句的时态一致,符合上述原则。但如果宾语从句表示客观事实和真理,即使主句谓语用过去时,从句的谓语也应该使用一般现在时:如: O ur teacher told us a little knowledge is dangerous 我们老师告诉我们一知半解是危险的。 He said that light travels faster than sound. 他说光传播速度比声音快。 2、有些形容词后可以跟从句,这种从句常看成宾语从句,它的主、从句时态也符合上述原则。这些形容词有:afraid, glad, sure, sorry, certain, aware, confident, delighted, lucky, surprised, worried。如: I’m sure that he will succeed. 3、主语从句、表语从句、同位语从句也要与主句的时态一致。如: That is why he was late for school. 例题: 1. Miss Gao isn’t here. She _______ to the station to meet Mr Brown. A. went B. has gone C. has been D. would go 2. ________ a letter from him since he left.

英文资料完整版

TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS FEATURES · complete pwm power-control circuitry · uncommitted outputs for 200-ma sink or source current · output control selects single-ended or push-pull operation · internal circuitry prohibits double pulse at either output · variable dead time provides control over total range · internal regulator provides a stable 5-v reference supply with 5% tolerance · circuit architecture allows easy synchronization INSTRUCTIONS The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits. The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation. The TL494C is characterized for operation from 0°C to 70°C. The TL494I is characterized for operation from –40°C to 85°C.

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