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【单选题】
铸造圆角的主要作用是A.
方便起模
B.
阻止浇不到和
C.
防止气孔和夹杂物
D.
防止冲砂和应力集中
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反馈参考答案：
举一反三
【单选题】When connecting the tow bridle拖索to a tug, the end of the bridle is passed with a _____.
A.
heaving line
B.
shot line
C.
high line
D.
messenger line
【单选题】When connecting the tow bridle to a tug, the end of the bridle is passed with a _____.
A.
heaving line
B.
shot line
C.
high line
D.
messenger line
【单选题】NA表示阿伏加德罗常数，下列说法错误的是（ ）
A.
摩尔是物质的量的单位，简称摩，符号为mol
B.
气体摩尔体积就是22.4L
C.
1molH 2 O含有的水分子数目为N A
D.
0.5NA个Cl 2 的物质的量是0.5mol
【简答题】Quiz Directions: Please fill in the blanks with the words you hear. 1. Of the world's ten tallest bridges, 1 be found in China with five of them built in the 2 years. And here is the 3 , the Beipanjia...
【单选题】物理量的符号及其单位的符号都正确的是
A.
阿伏加德罗常数： N A , mol
B.
摩尔质量：M ,g·mol -1
C.
气体摩尔体积：Vm , mol·L -1
D.
物质的量浓度：c, L·mol -1
【单选题】When the elbow is flexed, Shaohai is at the midpoint of the line connecting the ( )of the transverse cubital crease and the medial epocindyle of the humerus.
A.
lateral end
B.
medial end
C.
middle portion
D.
radial end
【单选题】【单选】When connecting the tow bridle to a tug, the end of the bridle is passed with a _______.
A.
heaving line
B.
shot line
C.
high line
D.
messenger line
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