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【单选题】
51 系列单片机的 4 个并行 I/O 端口作为通用 I/O 端口使用,在输出数据时,必须外接上拉电阻的是( )。A.
P3 端口
B.
P2 端口
C.
P0 端口
D.
P1 端口
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【单选题】Which of the following is TRUE of the service at a bar?
A.
A customer has to tip the waitress.
B.
A customer has to pay each time he gets drinks.
C.
A customer has to pay for all the drinks when he is leaving.
D.
A customer has t9 sit at the table to wait for their turn to be served.
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【单选题】大连盛凯公司(0903535020)委托辽宁省机械设备进出口公司(0801914031)与日本三菱重工签约进口工程机械，并委托大连外运公司代理报关，在填制进口报关单时，“经营单位”栏应填( )。
A.
大连盛凯公司0903535020
B.
辽宁省机械设备进出口公司0801914031
C.
大连盛凯公司
D.
大连外运公司
【单选题】Which of the following is TRUE of the service at a bar?
A.
A customer has to tip the waitress.
B.
A customer has to pay each time he gets drinks.
C.
A customer has to pay for all the drinks when he is leaving.
D.
A customer has to sit at the table to wait for their turn to be served.
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