在对钢进行热处理的时候,为使钢的室温组织奥氏体化,需对材料进行________。
A. 加热
B. 保温
C. 加热和保温
D. 加热或保温
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钢的成分是形成本质粗或细晶粒钢的主要原因,钢中的________等合金元素有阻止奥氏体晶粒长大的作用。Ⅰ.钒;Ⅱ.钛;Ⅲ.钨;Ⅳ.锰;Ⅴ.碳;Ⅵ.铬。
A. Ⅰ+Ⅱ+Ⅳ+Ⅴ
B. Ⅰ+Ⅱ+Ⅲ+Ⅵ
C. Ⅳ+Ⅴ
D. Ⅲ+Ⅳ+Ⅴ
钢的成分是形成本质粗或细晶粒钢的主要原因,钢中的________等合金元素有促进晶粒长大的作用。Ⅰ.钒;Ⅱ.钛;Ⅲ.钨;Ⅳ.锰;Ⅴ.碳;Ⅵ.铬。
A. Ⅰ+Ⅱ+Ⅳ+Ⅴ
B. Ⅰ+Ⅱ+Ⅲ+Ⅵ
C. Ⅳ+Ⅴ
D. Ⅲ+Ⅳ+V
If the diagnosis had been narrowed between viral meningitis and tuberculosis meningitis, which of the following tests would be useful in the rapid differentiation of the two?
A. guinea pig inoculation
B. acid-fast stained smear of the spinal fluid
C. cough plate
D. gram staining method
Which test is NOT useful to diagnose the purulent meningitis?
A. Pandy’s test
B. cell count
C. examine bacterium
D. complement fixation test