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【单选题】
()是第三利润源的主要源泉。A.
仓储
B.
运输
C.
保管
D.
流通加工
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反馈参考答案：
举一反三
【简答题】在电阻、电感、电容元件相串联的电路中，已知R=30Ω，L=127mH，C=40μF，电源电压 。
求感抗、容抗和阻抗模。
【单选题】The meeting has been on for five hours and the plan of our activity is still____. [ ]
A.
uncertain
B.
known
C.
certain
D.
sure
【单选题】— The plan I put forward at the meeting has been _____. — That's great. [ ]
A.
approved
B.
mastered
C.
absorbed
D.
rejected
【单选题】The meeting has been postponed till next Friday.
A.
called off
B.
taken off
C.
put off
D.
pulled off
【简答题】The meeting has been put for a week.
【单选题】The date of the meeting has been from Friday to Monday.
A.
polluted
B.
owned
C.
mined
D.
advanced
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