【名词&注释】
中华人民共和国(prc)、机动船(motor vessel)、受限制的(restricted)
[单选题]Positive displacement, helical gear pumps are well suited for pumping oil because
A. stuffing boxes eliminate the leakage problems usually associated with other gear pumps
B. it is not necessary to closely maintain design clearances with this pump
C. they are essentially self-priming and produce a high suction lift
D. these pumps are designed with extreme tooth angles
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举一反三：
[单选题]With reference to a two-ram actuating mechanism, which one of the following statement is FALSE?
A. The rams work inside cylinders.
B. The cylinders have glands sealing their open ends.
C. The rams are connected to a cross-head
D. The cross-head is mounted on the rudder stock
[单选题]《中华人民共和国非机动船安全航行暂行规则》中规定，非机动船在航时应给________让路。
A. 从事捕鱼的船舶
B. 所有操纵能力受限制的船舶
C. 所有操纵失灵的船舶
D. 除机动船外的被追越船
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