滚动轴承的型号由7位数字组成,右起第一、二位数字表示轴承的内径,当内径为20~45mm时,型号中数字乘以()即等于其内径。
A.3
B.4
C.5
D.6
参考答案:C
颅内压增高头痛的特点是()
A.夜间轻
B.喷嚏时减轻
C.咳嗽时减轻
D.低头时减轻
E.晨起较重
________ good advice you've told me! Thank you very much! [ ]
A. What
B. What a
C. How