关于产褥期的临床表现，哪项是正确的A．产后第1天宫底稍下降 B．产后初期产妇脉搏增快

130安培=____毫安=____微安

We couldn't go out _____ it is too cold today.    [ ]

A. but  

B. if    

C. or    

D. because

— Shall I help clean the kitchen, Mom?  

— Thank you. But you ________ it because I can do it myself. [      ]

A. mustn't have done

B. wouldn't have done  

C. mightn't have done

D. don't have to do

评分必须以一定的比较标准为依据，评分的标准可分为绝对标准和（）两种。