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【单选题】
船体主要结构图的用途有（）。 Ⅰ表明了船体构件的尺度； Ⅱ是造船时计算强度和选用材料的依据； Ⅲ是修船时更换板材或骨架的依据。A.
Ⅰ、Ⅱ
B.
Ⅱ、Ⅲ
C.
Ⅰ、Ⅱ、Ⅲ
D.
Ⅰ、Ⅲ
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皮皮学刷刷变学霸
举一反三
【单选题】During compressors running the accumulated moisture in the separators must be _____.
A.
drained off
B.
collected
C.
sent to the crankcases
D.
separated with oil
【单选题】By far the greatest item of maintenance of the reciprocating air compressors concerns _____.
A.
the lubrication
B.
the cooling
C.
the moisture separation
D.
the valves
【简答题】During operation, gas enters a centrifugal compressor at the suction inlet and isaccelerated radially by moving ________ . Centrifugal compressors haveone moving element, the _____ and ______.
【简答题】Compressors differ from pumps in that pumps move ______ and compressors move ______ .
【单选题】Which of the following statements is true concerning the overall efficiency of air compressors?
A.
High pressure compressors are more efficient than low pressure compressors
B.
Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit
C.
Two stage compressors are generally more efficient than single stage compressors.
D.
The volumetric efficiency is decreased in multistage compressors
【单选题】Air compressors are equipped with unloading systems for the purpose of _____.
A.
removing all but the frictional load during starting
B.
relieving intercoolers of high temperature buildups
C.
providing high starting torque in the drive motor
D.
seating valve plates during compressor shutdown
【简答题】触发器是能存储( )数码的一种数字电路。
【单选题】下列四个选项是对皮亚杰个体思维发展理论的叙述和评价，其中不正确的一项是()．
A.
阶段出现的先后顺序固定不变，每一阶段都有其独特的图式或认知结构
B.
图式或认知结构的发展是一个连续建构的过程
C.
皮亚杰将思维发展的过程分为四个阶段的顺序是：感知一动作阶段、前运算阶段、形式运算阶段、具体运算阶段
D.
现在有些心理学家对皮亚杰的思维发展理论的某些观点存在质疑
【单选题】某企业2013年度的利润总额为1 000万元,其中包括本年收到的国库券利息收入20万元;假定业务招待费税法规定的扣除标准为400万元,企业全年实际发生的业务招待费为350万元,企业所得税税率为25%。该企业2013年所得税费用为( )万元。
A.
250
B.
232.5
C.
245
D.
257.5
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