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【单选题】
FX2N系列PLC内部的状态继电器,其通用状态继电器用作顺序功能图的中间状态,元件编号为()A.
S0~S9
B.
S10~S19
C.
S20~S499
D.
S500~S899
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举一反三
【单选题】Some children have never seen a dentist before starting school.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】听音判断，对的打“√”，错的打“×”。 1. 2. 3. ( ) ( ) ( )
【单选题】Before starting any diesel or gasoline engine, which of the following must be checked?____.
A.
Oil level
B.
Flow of cooling water
C.
Exhaust discharge
D.
All of the above
【简答题】听音，对的打“√”，错的打“×”。 1. 2. 3. 4. ( ) ( ) ( ) ( )
【简答题】情景会话。情景适当的图打“√”，否则打“×”。 ( ) 1. ( ) 2. ( ) 3.
【单选题】Before starting a gasoline engine on a motorboat，you should make sure for safety that ______．
A.
The gasoline tank is full
B.
The bilges，cabins，etc．are thoroughly ventilated
C.
You have fresh water on board
D.
Each of the above is followed
【单选题】Before starting an air compressor, It should be _____.
A.
unloaded
B.
primed
C.
filled with water
D.
greased
【简答题】听音，判断正误，对的打“√”，错的打“×”。 1. 2. 3. ( ) ( ) ( )
【简答题】听音，判断正确打“√”，错的打“×”。 1. 2. 3. 4. ( ) ( ) ( ) ( )
【单选题】Before starting, the cylinders and pistons must be warmed up ( ).
A.
quickly
B.
usual
C.
gradually
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