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【单选题】
逻辑运算A·A=A,是利用了逻辑代数的( )。A.
互补律
B.
自等律
C.
反演律
D.
结合律
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】When you check in the hotel , you need to ( ).
A.
sign the register.
B.
call the phone.
C.
keep the change.
D.
take the order.
【单选题】If you ___________ for your flight, you need to cancel checkin to be able to change your flight.
A.
already check in
B.
had already checked in
C.
have already checked in
D.
already checked in
【单选题】下列关于运营指标分析，说法错误的是()
A.
列车运行图兑现率是实际开行列车数与列车运行图计划开行的列车数之比
B.
列车正点率就是始发正点率
C.
凡按列车运行图固定车次、时间准点始发、到达终点的列车都统计为正点列车数
D.
列车运行通过率是在车站不停车通过的开行列车数与全部列车数之比
【单选题】What do you need to check before booking your travel and accommodation?
A.
Check the budget
B.
Check the objectives
C.
Check the travel information
D.
Check the missions
【单选题】How many securities do you need to ________ there?
A.
check the order
B.
keep the order
C.
stand in line
D.
join forces
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