Corrosion inhibitors and/or soluble oils a

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问题:

Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to ()

A.maintain low pH in the cooling water

B.reduce the cooling water temperature

C.increase cooling water hardness

D.form a protective film on metal surfaces

考点:轮机英语船舶电气与船舶安全船舶电气与船舶安全题库
题型:单项选择题

下列关于各环境要素环境质量监测技术要求的说法,正确的有()。

A.环境空气质量测试一般不少于5天

B.水环境质量测试一般为1~3天,每天1~2次

C.城市环境电磁辐射监测中,若24h昼夜监测,其频次不得少于10次

D.环境噪声测试一般不少于3天

题型:单项选择题

My little brother likes this kind of pizza. Please give him _______ .

A.another

B.other

C.the other

D.others

题型:单项选择题

口服液的纯化可采用的方法有

A.壳聚糖澄清法

B.101果汁澄清法

C.SFE法

D.高速离心法

E.超声波处理法

题型:单项选择题

—How was your school trip, Mingming?      

—t was _____.We had a great time there.      

A. fantastic

B. important        

C. boring  

D. strange

题型:单项选择题

红会法规定红十字会的第四项职责是参加国际人道主义救援工作。

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