正确答案: A

1∶4

题目：正常人呼吸次数与心率比例为：

解析：A

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举一反三的答案和解析：

[单选题]Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?

hydraulic cylinders

[单选题]SOLAS公约规定，救生艇机的航速必须满足当载足全部乘员和属具，并且所有发动机驱动的辅助装置均运转时，救生艇在静水中前进航速应至少为_______，而当拖带1具载足全部乘员和属具的25人救生筏或其相等负载时航速应至少为_______。

6kn/2kn

[单选题]救助艇在向航行中的船舶靠泊时在操作上要注意（）

在船舶的下风舷，船首附近与船舶保持乎行，在船中附近贴靠

[单选题]The spur geared mooring winches have advantages over worm geared ones in .

higher efficiency of the gear train while reversing

[单选题]Crankcase explosions in propulsion diesel engines result from

the ignition of unburned fuel and air in the crankcase

[单选题]下列说法哪个正确？________。

A和B均不正确

[单选题]In fighting a fire in a fuel tank, the FIRST action you should attempt is to _____.

top off the tank to force out all vapors

[单选题]When placed in a magnetic field, which of the materials listed will maintain the highest permeability?( )

Soft iron

解析：解析：magnetlc：磁的;permeability：渗透;Bakelite：电木;aluminum：铝