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【判断题】
当一种零部件可以由多种设备加工时,一般而言,零部件应该交由相对成本较低的设备去加工。( )A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】I had a little trouble _____ English grammar. [ ]
A.
learn
B.
learned
C.
learning
D.
to learn
【单选题】It is important for us ______ English well. [ ]
A.
learn
B.
learned
C.
to learn
D.
to learning
【简答题】Only years later _____ the truth about the matter. A) I learned B) did l learn C) I did learn D) had I learned
【单选题】Do you have any trouble _______ English grammar? [ ]
A.
learn
B.
learned
C.
learning
D.
to learn
【简答题】learn--learned--
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