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【简答题】
设备在使用或闲置过程中,在外力或自然力的作用下,必然会产生磨损。磨损可分为 、 、 三种。根据不同磨损情况,可采取 、 和 等不同方式进行补偿。
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【简答题】晶体三极管有三种基本的工作状态,当其发射结 ,集电结 时,工作在放大区;当发射结正偏,集电结 时,工作在饱和区;当发射结反偏,集电结 时,工作在截止区。
【单选题】Choose the phrase for the picture (为图片选短语) :
A.
serve at the bus stop
B.
work as waiters or waitress in a restaurant
C.
work on the assembly line
D.
g o to a factory to help them make posters
【单选题】B Listen to the dialogue again, and then choose the best answer. 1. The man __________.
A.
orders beef and fish
B.
asks the waitress to recommend some dishes
C.
does not like duck
D.
o
【单选题】People who dine in a New York restaurant
A.
are not expected to give any tip to the waiter or waitress.
B.
had better tip more than 15% so as not to be shamed.
C.
may be looked down upon when offering a considerable tip.
D.
are thought of as generous if they tip 15%.
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