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第一心音的产生主要是由于()。

单选题
2021-09-01 20:30
A、半月瓣关闭
B、半月瓣开放
C、房室瓣关闭
D、房室瓣开放
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正确答案
C

试题解析

感兴趣题目
()shall be liable for loss of and damage to the Vessel and/or goods arising or resulting from inaccuracies in stating the description,quantity,weight,measurement or contents.
Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo,without the authorization or privity of the Shipowner or his agent,is().
(), or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.
A salvor may be()the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.
The () is used for hauling in or letting out the wires or ropes.
Vessels must be()valid certificate of nationality or certificated of registry or license.
When loading or discharging dry mud or cement,crew members should use goggles and().
Effects which are dutiable or subject to prohibitions or restrictions should be declared in ().
逻辑运算符(AND、NOT、OR)的运算顺序是AND→OR→NOT。
产生第一心音的主要成分是()所引起的振动,构成第二心音的成分是()所引起的振动,第四心音是由()产生的振动。
第一心音的产生,主要由于()和()突然关闭的振动所致;第二心音的产生,主要由于()和()突然关闭的振动所致。
逻辑运算符(AND、NOT、OR)的运算顺序是AND→OR→NOT。
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