单项选择题

All the holds to be loaded with grain must be swept（）commencement of loading.

A.Cleanly/during
B.Clear/meanwhile
C.Clean/between
D.Clean/prior to

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单项选择题

A.slipway
B.graving dock
C.ground warp
D.caisson dock

单项选择题

A.Hydraulic drive systems
B.Electric drive systems
C.Steam drive systems
D.Man-powered drive systems

单项选择题

A.a master controller or switchbox
B.a group of relays
C.contactors
D.a solenoid brake