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【判断题】
铸造按生产方法不同,可分为砂型铸造和机器铸造。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】My wallet is nowhere to be found. I______ when I was on the bus.
A.
must drop it
B.
should have dropped it
C.
must have dropped it
D.
had dropped it
【单选题】My wallet is nowhere to be found. I______it when I was on the bus.
A.
must drop
B.
had dropped
C.
must have dropped
D.
should have dropped
【简答题】My wallet is nowhere to be found.I_____it when I was on the bus. a.must drop b.should have dropped c.had dropped d.must have dropped
【简答题】从原理课研究的角度来说,机器和机构有区别吗?
【单选题】My wallet is nowhere to be found. I () in the store.
A.
must drop it
B.
must have dropped it
C.
should have dropped it
D.
ought to have dropped it
【单选题】-What's the matter,Mary? You look ________! -My wallet is nowhere to be found,and my identification card (身份证) is in it. [ ]
A.
disappointed
B.
moved
C.
excited
D.
upset
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