先天性甲状腺功能减低症与21-三体综合征的主要鉴别依据()
A.智能是否低下
B.有无身材矮小
C.骨龄落后
D.动作发育迟缓
E.甲状腺素检查和染色体检查
参考答案:E
—Would you go to the museum with me this Sunday?
—Sorry, _______. My aunt is coming to visit the family. We plan to have a welcome party then.
A.I don’t
B.I can’t
C.I needn’t
D.I mustn’t
护坝桩从坝脚线开始,沿坝坡面高差每隔( )布设一排木制护坡桩。
A.2m
B.3m
C.4m
D.5m