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【单选题】
Decide w hether the following statements are true(T)or false(F) according to the Text. ( ) People should not eat or drink while they are on the phone.A.
T
B.
F
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举一反三
【单选题】_____supplies pilot air to the control cylinders air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【单选题】supplies pilot air to the control cylinders of the cylinder air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【简答题】哥斯达黎加的首都是_____
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