皮皮学，免费搜题
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【单选题】
女性生殖系统的防御机制,哪一项最重要:
A.
阴道的自净作用
B.
宫颈内口的闭合
C.
宫颈黏液 栓
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】Which statement concerning reserve sources of energy for GMDSS is FALSE ________．
A.
While the ship is at sea，there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energy
B.
Both the VHF and MF/HF installations must be simultaneously supplied
C.
A means of ensuring a continuous supply of electrical power must be provided to all GMDSS equipment that could be affected by an interruption in power
D.
If a UPS or equivalent is used to supply power to the ship's GPS receiver or other source of positional information，a means must be provided to ensure the continuous supply of the information in the event of a failure to the ship's main or emergency source of power
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【单选题】The time has come ______ we can make extensive use of nuclear energy．
A.
when
B.
which
C.
since
D.
while
查看完整题目与答案
【判断题】极重短截可强烈削弱枝条生长势和生长量,起到降低枝位,缓和树势的作用。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Chemistry is the science of ______ while physics is the science of energy.
A.
bodies
B.
objects
C.
substances
D.
matters
查看完整题目与答案
【单选题】布尔运算中实现合并运算的选项为：
A.
S ubtraction（ A-B ）
B.
cut
C.
intersection
D.
union
查看完整题目与答案
【单选题】世界上第一个试验火箭飞行的勇士是( )
A.
钱学森
B.
万户
C.
朱光亚
D.
钱三强
查看完整题目与答案
【简答题】布尔运算中实现合并运算的选项为 。
查看完整题目与答案
【多选题】电算化核算子系统的特点包括(    )。
A.
成本核算方法多样化、通用化软件亟待开发
B.
成本核算的数据流转具有复杂性
C.
成本核算勾稽关系具有复杂性
D.
与其他会计信息子系统交换数据多
查看完整题目与答案
【单选题】According to the text, animal welfare groups have succeeded in ______ .
A.
stopping all animal abuse in schools
B.
establishing guidelines that ban classroom experiments harming animals
C.
protecting animals from being experimented with in extracurricular projects
D.
persuading two national science teachers' associations to adopt an animal protection policy
查看完整题目与答案
【简答题】A．A pond can be compared to a round-the-clock restaurant. B．All kinds of plans and animals will move in soon after a pond is dug. C．Few of the animals in a pond live on plants. D．Not all the animals i...
查看完整题目与答案
相关题目：
【单选题】Which statement concerning reserve sources of energy for GMDSS is FALSE ________．
A.
While the ship is at sea，there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energy
B.
Both the VHF and MF/HF installations must be simultaneously supplied
C.
A means of ensuring a continuous supply of electrical power must be provided to all GMDSS equipment that could be affected by an interruption in power
D.
If a UPS or equivalent is used to supply power to the ship's GPS receiver or other source of positional information，a means must be provided to ensure the continuous supply of the information in the event of a failure to the ship's main or emergency source of power
查看完整题目与答案
【单选题】The time has come ______ we can make extensive use of nuclear energy．
A.
when
B.
which
C.
since
D.
while
查看完整题目与答案
【判断题】极重短截可强烈削弱枝条生长势和生长量,起到降低枝位,缓和树势的作用。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Chemistry is the science of ______ while physics is the science of energy.
A.
bodies
B.
objects
C.
substances
D.
matters
查看完整题目与答案
【单选题】布尔运算中实现合并运算的选项为：
A.
S ubtraction（ A-B ）
B.
cut
C.
intersection
D.
union
查看完整题目与答案
【单选题】世界上第一个试验火箭飞行的勇士是( )
A.
钱学森
B.
万户
C.
朱光亚
D.
钱三强
查看完整题目与答案
【简答题】布尔运算中实现合并运算的选项为 。
查看完整题目与答案
【多选题】电算化核算子系统的特点包括(    )。
A.
成本核算方法多样化、通用化软件亟待开发
B.
成本核算的数据流转具有复杂性
C.
成本核算勾稽关系具有复杂性
D.
与其他会计信息子系统交换数据多
查看完整题目与答案
【单选题】According to the text, animal welfare groups have succeeded in ______ .
A.
stopping all animal abuse in schools
B.
establishing guidelines that ban classroom experiments harming animals
C.
protecting animals from being experimented with in extracurricular projects
D.
persuading two national science teachers' associations to adopt an animal protection policy
查看完整题目与答案
【简答题】A．A pond can be compared to a round-the-clock restaurant. B．All kinds of plans and animals will move in soon after a pond is dug. C．Few of the animals in a pond live on plants. D．Not all the animals i...
查看完整题目与答案