超声治疗法的禁忌证为()
A.恶性肿瘤
B.活动性结核
C.两者均是
D.两者均否
参考答案:C
The company was willing to provide us with what we needed, _____ made us excited.
A.what
B.it
C.which
D.that
高速铁路应严格实行天窗修制度,天窗时间应固定,一般不得少于()min。