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【单选题】
在操作按钮联锁或按钮、接触器双重联锁的正反转控制线路时,要使电动机从正转转为反转,正确的操作方法是( )。A.
可直接按下反转启动按钮
B.
可直接按下正转启动按钮
C.
必须先按下停止按钮，再按下反转启动按钮
D.
必须先按下停止按钮，再按下正转启动按钮
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举一反三
【单选题】What can you do in the cinema?
A.
Eat some food.
B.
Have some drinks.
C.
Smoke in the area provided.
【单选题】(Unlike) Americans who seem (to prefer) coffee, the English (drinks) (a great deal) of tea.
A.
Unlike
B.
to prefer
C.
drinks
D.
a great deal
【单选题】People who don't smoke have less ______________ of suffering from lung disease than those who smoke. [ ]
A.
potential
B.
cause
C.
hope
D.
problem
【简答题】It will help if the person who is suffering from flu drinks lots of ______.
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