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【单选题】
在收治新型病毒肺炎患者(确诊病例、疑似病例)的病房、 ICU 和留观室工作的所有工作人员,应佩戴( )A.
医用防护口罩
B.
一次性医用口罩
C.
医用外科口罩
D.
KN95/N95 及以上颗粒物防护口罩
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】已知命题：p：?x∈R，cosx≤1，则￢p为（ ）
A.
?x∈R，cosx≥1
B.
?x∈R，cosx≥1
C.
?x∈R，cosx＞1
D.
?x∈R，cosx＞1
【单选题】_______ the illegal mobile WAP sites worries many parents. [ ]
A.
The children's surfing
B.
The children surf
C.
The children surfing
D.
The children have surfed
【单选题】若 1+cosx 1-cosx - 1-cosx 1+cosx =- 2 tanx ，则角x为第（ ）象限的角．
A.
（1）（2）
B.
（3）（4）
C.
（1）（4）
D.
（2）（3）
【单选题】命题p：?x∈R，cosx＞1的否定是（ ）
A.
￢p：?x∈R，cosx≤1
B.
￢p：?x∈R，cosx≤1
C.
￢p：?x∈R，cosx＜1
D.
￢p：?x∈R，cosx＜1
【简答题】阅读理解。 It was Sports Day at School. There were many races. Lots of parents were watching the children. There was a large crowd of people. Some girls were talking about the races. They were talking abou...
【简答题】函数y= 3cosx+1 cosx+2 的值域是______．
【简答题】She must be very tired. _______so many little childrenis a very hard job. A. To have looked after B. Having lookedafter B. Look after D. Looking after
【单选题】已知命题p：?x∈R，cosx≤1，则（ ）
A.
￢p：?x∈R，cosx≥1
B.
￢p：?x∈R，cosx＜1
C.
￢p：?x∈R，cosx≤1
D.
￢p：?x∈R，cosx＞1
【简答题】命题“?x∈R，cosx≤1”的否定是（ ） A．?x∈R，cosx≥1 B．?x∈R，cosx＞1 C．?x∈R，cos≥1 D．?x∈R，cosx＞1
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