單項選擇題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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1.單項選擇題A large basin cut into the shore，closed off by a caisson，and used for drydocking of ships is known as a（）.
A.slipway
B.graving dock
C.ground warp
D.caisson dock
2.單項選擇題（） is not usually used in liquid cargo systems.
A.Hydraulic drive systems
B.Electric drive systems
C.Steam drive systems
D.Man-powered drive systems
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