皮皮学，免费搜题
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【单选题】
教师与学生的交往过程( )为主渠道展开。A.
课堂
B.
社会调查
C.
自然考察
D.
各类生产劳动
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】What is usually used as the nucleus for a cultured pearl?
A.
A fragment of mollusk shell.
B.
A large grain of sand.
C.
A particle of plant material.
D.
A tiny parasite.
【单选题】Since most medium-speed diesel engines are non-reversible, what is usually used to cater for astern thrust?
A.
reversing gear
B.
controllable pitch propeller
C.
fixed-pitch propeller
D.
a clutch
【单选题】Since most medium-speed diesel engines are non-reversible, what is usually used to cater for astern thrust?
A.
A reversing gear.
B.
A controllable pitch propeller.
C.
A fixed pitch propeller.
D.
A clutch.
【单选题】Since mot medium-speed diesel engines are non-reversible, what is usually used to cater for astern thrust?
A.
A reversing gear
B.
A controllable pitch propeller
C.
A fixed pitch propeller
D.
A clutch
【单选题】Since most medium-speed diesel engines are non-reversible, what is usually used to cater for astern thrust?
A.
大多数中速柴油机是不可倒转的,通常要使用什么来实现倒车推进?
B.
A reversing gear.换向机构
C.
A controllable pitch propeller. 可调螺距螺旋桨
D.
A fixed pitch propeller. 固定螺距螺旋桨
E.
A clutch. 离合器
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