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●试题五 什么是防火墙,有哪些类型,比较它们在维护网络安全方面的优缺点。
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【单选题】以下对有氧运动描述不正确的是()
A.
运动时间持续 30 分钟左右
B.
是在体内充分供氧产生能量的持续性运动
C.
运动强度要求达到靶心率
D.
仅指在密闭健身房内跑步机上的运动
【判断题】缓冲溶液的总浓度一定,缓冲比等于1时,缓冲容量最大。
A.
正确
B.
错误
【单选题】【单选】Hours of rest may be divided into no more than two periods, one of which shall be at least _____in length.
A.
five hours
B.
seven hours
C.
six hours
D.
four hours
【判断题】当缓冲溶液的总浓度一定时,缓冲比等于1,则缓冲容量最大。
A.
正确
B.
错误
【单选题】In maritime Labor convention, hours of rest may be divide into no more than periods,one of which shall be at least six hour in length, and the interval between consecutive period of rest shall not exc...
A.
12
B.
10
C.
18
D.
14
【判断题】维持一个老顾客和寻求一个新顾客的成本是等同的。
A.
正确
B.
错误
【判断题】赫尔巴特在教育目的的价值取向上坚持个人本位论。()
A.
正确
B.
错误
【单选题】According to Maritime Labour Convention 2006,hours of rest may be divides into no more than_____.
A.
one perod
B.
two periods
C.
three periods
D.
four periods
【单选题】In maritime labour convention, hours of rest may be divided into no more than periods, one of which shall be at least six hour in length, and the interval between consecutive periods of rest shall not...
A.
14
B.
10
C.
12
D.
18
【单选题】In maritime labour convention, hours of rest may be divided into no more than two periods, one of which shall be at least six hour in length, and the interval between consecutive periods of rest shall...
A.
14
B.
10
C.
12
D.
18
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