面神经炎的体征表述不正确的是（） A.病侧鼻唇沟变浅，嘴角下垂 B.鼓腮时漏气 C.

下列各项属于高处坠落伤害的是( )。

A．建筑物坍塌，员工被水泥板砸伤
B．员工不慎坠落，撞击到脚手架导致死亡
C．起吊的重物脱落，将员工击伤
D．脚手架上坠落的钢筋打击员工头部，导致其死亡

It was in New Zealand _______ Elizabeth met Mr. Smith.

A．that

B．how

C．which

D．when

用适当的介词填空。

1. His great grandmother became ill _____ a kind of disease.

2. What do you think _____ Jane's attitude toward life?

3. She can answer just _____saying "Hello".

4. _____ a disabled person, she is strong enough.

5. —Could you open the door _____ me, please?

    —Sure!

6. Let's think about the good things _____ our life, and we'll feel better.

一起重机将质量m=1000kg的货物匀加速竖直吊起，2s末货物的速度为v=4m/s，g取10m/s²，不计额外功．求：

（1）起重机对货物的拉力在这2s内所做的功为多大？

（2）起重机对货物的拉力在2s末的瞬时功率为多大？

常量蒸馏法硼酸的浓度是（）

A、0.1%

B、0.5%

C、1%

D、2%