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【单选题】
下列句子中，标点符号使用有误的一项是（3分）…………………………………【】A.
“吹面不寒杨柳风”，不错的，像母亲的手抚摸着你。
B.
“哎呀，真是美极了。”皇帝说：“我十分满意”！
C.
福建野生着的，一到北京就请进温室，且美其名曰“龙舌兰”。
D.
请闭上眼睛想：一个老城，有山有水，天底下晒着阳光，暖和安适地睡着，只等春风来把它们唤醒，这是不是个理想的境界？
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皮皮学刷刷变学霸
举一反三
【单选题】If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be _____.
A.
contaminated fluid
B.
pitted thrust rings
C.
worn pintle bearings
D.
obstructed suctions passage
【简答题】山顶点提取.zip 已经给定DEM,1求取该DEM的坡向变量;2提取DEM的山顶点和山谷点
【简答题】radial piston pump
【单选题】An axial轴向 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】With reference to a radial piston pump, which one of the following statements is false?
A.
Surrounding the fixed shaft is a hollow shaft
B.
This hollow shaft carries radial bores
C.
Each bore is fitted with a well-lapped plunger
D.
There are always even numbers of bores
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