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【单选题】
关于太阳系八大行星的叙述，下列说法正确的是A.
八大行星中，距太阳最近的是金星
B.
火星和木星之间存在小行星带
C.
八大行星具有同向性，所以自转方向都是自西向东
D.
天王星和海王星同属于巨行星
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【简答题】铜单质及其化合物是应用极其广泛的物质。 (1)铜是氢后金属，不能与盐酸发生置换反应，但将单质铜置于浓氢碘酸中，会有可燃性气体及白色沉淀生成，又知氧化性：Cu 2 ＋ >I 2 ，则铜与氢碘酸反应的化学方程式为__________________________________ (2)已知Cu 2 O能溶于醋酸溶液或盐酸中，同时得到蓝色溶液和红色固体，则Cu 2 O与稀硫酸反应的离子方程式为____...
【单选题】Networks are monitored by security personnel and supervised by ____ who set(s) up accounts and passwords for authorized network users.
A.
IT managers
B.
the government
C.
network administrators
D.
password administrators
【单选题】Security personnel refused to _______ him or his wife into the Embassy.
A.
admire
B.
recognize
C.
admit
D.
approach
【单选题】曲路密封有径向和轴向曲路两种布置方式,但通常常用径向曲路,这是因为 _____________________ 。
A.
径向曲路结构简单
B.
轴向曲路结构易因温度变化的伸缩有使旋转片与固定片相接触的可能
C.
轴向曲路制造成本高
D.
径向曲路密封效果好
【单选题】According to the authorities, why were thousands of security personnel on duty?
A.
Because they were putting out the fire.
B.
Because they were rehearsing the fireworks show
C.
Because they were on New Year’s duty
D.
Because they were putting down a riot.
【判断题】Passport control for the passengers taking international flights is conducted by security personnel.
A.
正确
B.
错误
【单选题】The security personnel check every attendee carefully to the successful commencement of the summit meeting.
A.
assure
B.
insure
C.
reassure
D.
ensure
【单选题】What is the womans job?
A.
Policewoman.
B.
Airline clerk.
C.
Security personnel.
D.
Air hostess.
【简答题】They will work as gas station attendants, __________, housekeepers and security personnel
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