哪两个轮子的转动方向是一致的'（很简单，所以图略）
8。这些筐架由铁丝拉牢的方式不同,哪一种刚性最好?（很简单，所以图略）
9。判定图中关闭那个龙头来阻值水流出来。（很简单，所以图略）
Match the following designations with their functions:
cts and breaks as quick as possible abnormal currents exceeding 10 in ()
tely makes or breaks an on-load circuit ()
cts current increase up to 10in and stops the starter before the temperture rise of the motor and conductor deteriorates the insulating materials ()
A. swiching
B. protection against shotr-circuits
C. isolation
D. protection against overloads
第二部分 看图选择
给你一段ppt，然后回答四个问题
第三部分 英语写作
"if world without Communication Engineers"