有塑化作用()
A.丁香油
B.氢氧化钙
C.金属砷
D.塑化剂
E.甲醛甲酚
参考答案:D
神经纤维瘤病的临床特点不包括()
A.腋窝和腹股沟区雀斑
B.耳聋
C.皮脂腺瘤
D.躯干四肢皮肤色素脱失斑
E.额面部红葡萄酒色扁平血管痣
He looked as if he _____ the answer.
A.knew
B.had known
C.knows
D.has known