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【单选题】
根据《中华人民共和国测绘成果管理条例》规定,利用涉密测绘成果开发生产的产品,未依法进行保密技术处理的,其秘密等级确定原则是___。
A.
按所用的测绘成果密级定密
B.
按最高密级定密
C.
不得低于所用测绘成果的秘密等级
D.
由测绘地理信息主管部门定密
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参考答案:
举一反三
【简答题】He brought us a piece of (surprise) ______ news.
【单选题】下列电子式中错误的是
A.
钠离子:
B.
氢氧根离子:
C.
氨分子:
D.
一氯甲烷:
【判断题】通过读秀学术搜索的文献传递功能,读者邮箱接收到的资料,可以在校园网范围之外打开阅读。
A.
正确
B.
错误
【单选题】下面有关自旋弛豫的叙述,错误的是( )
A.
T1驰豫是处于激发态的自旋质子返回到原来的状态的过程
B.
T2驰豫是因为自旋质子的失相位
C.
T1驰豫和T2驰豫是先后发生的两个驰豫过程
D.
自旋驰豫是在RF 脉冲被关闭后发生的
E.
以上都不对
【简答题】Though he was born and brought up in America, ?Though he was born and brought up in America, he can speak ___________ Chinese. A)fluid          B) smooth         C) fluent        D) flowing
【单选题】What is true about the man?
A.
He was born in Scotland and brought up in England.
B.
He was born in England and brought up in Scotland.
C.
He was born and brought up in Scotland.
D.
He was born and brought up in England.
【单选题】Although he was born and brought up in America, he ______ Chinese fluently.
A.
speaks
B.
will speak
C.
can speak
D.
would speak
【单选题】He was born in Beijing and _____ by his grandma in a seaside village.
A.
brought in
B.
brought out
C.
brought up
D.
brought back
【单选题】若 ,则下列式子中错误的是(     )
A.
B.
C.
【单选题】随机变量 ,记 ,则下列式子中错误的是
A.
B.
C.
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