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【判断题】
Occupational therapy helps your strength, mobility and fitness.A.
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B.
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【单选题】An axial piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned _____.
A.
radially from the shaft
B.
parallel to each other and to the shaft
C.
parallel to each other but at a right angle to the shaft
D.
at an angle to each other and to the shaft
【单选题】The function of the piston rings is to ________.
A.
help cool the piston by transferring heat from the piston to the cylinder wall
B.
provide a sliding seal between the piston and cylinder wall
C.
scrape oil off the cylinder wall as the piston moves down on the power and intake strokes.
D.
all of the above
【简答题】英译汉: piston
【单选题】蔗糖水解动力学实验应注意哪些问题？（ ）
A.
旋光仪不需要预热。
B.
旋光仪样品管有环状突出部分的一端应向下放置。
C.
测定旋光度时样品管外部应用滤纸擦干。
D.
样品管两端的玻璃片用滤纸擦干即可。
【单选题】Piston cooling fins are located
A.
atop the piston crown
B.
beneath the piston crown
C.
at the base of the piston skirt
D.
inside the cylinder liner cooling water jacket
【单选题】关于肺表面活性物质，下列哪项是正确的
A.
肺表面活性物质在胎龄18~20周时出现，35~36周达肺成熟水平
B.
由肺泡1型上皮细胞分泌产生
C.
肺表面活性物质缺乏不是引起新生儿肺透明膜病的主要病因
D.
肺表面活性物质人工制剂优于天然制剂
E.
肺表面活性物质的主要成分为蛋白质
【单选题】Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring___________.
A.
back
B.
side
C.
gap
D.
bottom
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