低钾血症时最早表现为
A.腱反射减退B.肠麻痹C.恶心,呕吐D.心电图出现"U"波E.肌肉无力
参考答案:E
The WTO cannot live up to its name _____ it does not include a country that is home to one fifth of mankind .
A.as long as
B.while
C.if
D.even though
近距离照像时,镜头前加装近摄镜使镜头焦距(),近摄镜倍数越大焦距越(),底片上成像影像越()