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【判断题】
在装配图中可省略螺栓、螺母、销等紧固件的投影,而用细点画线和指引线指明它们的位置。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】The girl is singing an English song in the next room is Tom’s sister.
【简答题】为什么输用成分输用全血更安全?
【简答题】某工程双代号网络图如下图所示，其绘图错误有（ ）。
【简答题】The girl spends half an hour walking to school.( 同义句改写 ) It ________ the girl half an hour to ________to school.
【单选题】_____that the girl with an incurable disease would die soon, the boy decided to help her make her last days beautiful and meaningful.
A.
Being found out
B.
Found out
C.
To find out
D.
Having found out
【单选题】A 30-kg girl steps to shore from a 60-kg boat, giving the boat an acceleration of 2 m/s2. If water resistance is neglected, the girl receives an acceleration of
A.
-4 m/s 2
B.
-15 m/s 2
C.
-1 m/s 2
D.
-8 m/s 2
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