PVA-124在处方中的作用为
A．膜材B．促渗透剂C．增塑剂D．脱膜剂E．都是
参考答案：A
I________at my watch and was surprised to see that it was nearly midnight. [ ]
A. glanced
B. observed
C. glared
D. stared
儿童青少年对碘缺乏比较敏感，突出的表现是（）.
A.甲状腺肿大
B.贫血
C.视力下降
