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【判断题】
移液管的体积校正:一支 10.00mL(20°C的移液管,放出的20°C为9.9814g,已知该温度时1ML的水质量为0.99178g,则此移液管在校准后的体积为10.01ML()A.
正确
B.
错误
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【单选题】5 Mark suggests that they _____.
A.
eat their picnic while travelling along the river
B.
move over to the bank and stop for a while
C.
eat their picnic in about ten minutes
D.
move over to the bank and eat their picnic
【简答题】Marksuggests that they _____.A. (a) eat their picnic while travelling along the river B. (b) move over to the bank and stop for a while C. (c) eat their picnic in about ten minutes D. (d) move over to...
【单选题】Mark suggests that he punt for _____.
A.
half an hour
B.
the first 20 minutes
C.
the first hour
D.
most of the trip
【简答题】51系列单片机具有几个中断源?其中哪些中断源可以被定义为高优先级中断,如何定义?
【单选题】设信号的波特率为500Baud,采用复合调制技术,由4种幅度和8种相伴组成16种码元,则食道的数据率为:
A.
500 bps
B.
1000 bps
C.
2000 bps
D.
4800 bps
【简答题】51系列单片机具有几个中断源,分别哪几个?其中哪些中断源可以被定义为高优先级中断,如何定义?
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