东风4B型内燃机车柴油机机油滤清器前后的压力差正常为()。
A.40~100kPa
B.100-150kPa
C.150~200kPa
参考答案:A
People a monument to honour those people who devoted their lives to their country.
A.set out
B.set down
C.set up
D.set on
麻疹具有早期诊断价值的临床表现是()
A.持续发热
B.淋巴结、肝、脾肿大
C.柯氏斑
D.全身皮疹
E.肺部湿啰音