單項(xiàng)選擇題The oil mist detectors continuously() the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.

A.detract
B.extract
C.pump up
D.pump down


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1.單項(xiàng)選擇題(), the repair in so short a time is unknown to us.

A.How they finished
B.How did they finished
C.That how they finished
D.That how did they finished

3.單項(xiàng)選擇題The fire of burning paper is classified as()fire.

A.Class A
B.Class B
C.Class C
D.Class D

4.單項(xiàng)選擇題The fire of electrical equipment is classified as()fire.

A.class A
B.Class B
C.Class C
D.Class D

5.單項(xiàng)選擇題The fire of fuel oil is classified as() fire.

A.Class A
B.Class B
C.Class C
D.Class D