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【单选题】
( )是铸件产生内应力、变形和裂纹等缺陷的主要原因。A.
液态收缩
B.
固态收缩
C.
凝固收缩
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】S1:Hello, Captain. Glad to meet you again. And it's really a pleasure to come on board your ship. Do you still remember me? My name is John Smith.S2:Oh, how are you, Mr. Smith? I do remember you. We m...
A.
Tow years ago.
B.
Half a year ago.
C.
A year and half ago.
D.
A year ago.
【简答题】银镜粘贴应选用 玻璃胶, 发泡胶压出后起迅速膨胀,起填充孔洞,粘合的作用
【单选题】I'm so glad to see you back, Lucy. How long _____ at your grandma's? [ ]
A.
had you stayed
B.
did you stay
C.
have you stayed
D.
do you stay
【简答题】德国正在运营的高速线及时速达200km的ICE列车的通行里程只占德国铁路总营业里程的1%和10%,却担负着( )的旅客周转量。
【简答题】德国正在运营的高速线及时速达 200km 的 ICE 列车的通行里程只占德国铁路总营业里程的 1％和 10％，却担负着 的旅客周转量A. 50%
【单选题】I'm so glad to see you back，Lucy. How long at your grandma's？
A.
had you stayed
B.
did you stay
C.
have you stayed
D.
would you stay
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