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【单选题】
雄激素主要由下列哪种细胞分泌A.
精子细胞
B.
精原细胞
C.
间质细胞
D.
支持细胞
E.
生精细胞
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反馈参考答案：
举一反三
【单选题】The two birds ________ each other in shape and color, in other words, they ________ each other in shape and color. [ ]
A.
differ; are different from
B.
differ from; are different with
C.
resemble; are similar to
D.
resemble; are similar with
【单选题】In an open lifeboat，the lifeboat compass is usually（）.
A.
placed in a fixed bracket when being used
B.
clamped to any position convenient for the coxswain to see it
C.
permanently mounted on the lifeboat's centerline
D.
mounted in the center of the boat to eliminate deviation
【单选题】each lifeboat shall be launched with its assigned operating crew aboard and maneuvered in the water at least ___ during an abandon ship drill.
A.
once every month
B.
once every two months
C.
once every three months
D.
once every six months
【单选题】Each lifeboat must be lowered and maneuvered in the water at least once every（）.
A.
2 months
B.
3 months
C.
4 months
D.
5 months
【简答题】根据液压泵与执行元件的组合方式不同,容积调速回路有四种形式,即( )容积调速回路( )容积调速回路、 定量泵-变量马达 容积调速回路、 变量泵-变量马达 容积调速回路。
【简答题】根据液压泵与执行元件的组合方式不同,容积调速回路有四种形式,即 变量泵-液压缸 容积调速回路 变量泵-定量马达 容积调速回路、( )容积调速回路、( )容积调速回路。
【简答题】《红楼梦》中的贾宝玉即是全书开篇神话中的()，他脖子上的通灵宝玉则是神话中的青埂峰的顽石。
【简答题】什么是关键活动AOV网?
【单选题】Frapping lines are fitted to lifeboat davits to ______.
A.
secure the lifeboat in the davits when in the stowed position
B.
bring the life boat close along the rail in the embarkation position
C.
give the occupants a safety line when the boat is being lowered from the embarkation level
D.
reduce the swinging of the lifeboat at the embarkation level
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