关于硅肺的描述，正确的是（） A.硅尘直径越大致病力越强 B.硅

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问题单项选择题

关于硅肺的描述，正确的是（）

A.硅尘直径越大致病力越强

B.硅结节内无免疫球蛋白

C.纤维性硅结节是硅肺早期病变

D.胸膜常无病变

E.硅肺分三期

答案

参考答案：E

多项选择题

体内生理性抗凝机制有（）

A.内皮细胞产生的前列腺素可对抗血小板聚集

B.蛋白质C

C.抗凝血酶Ⅲ和肝素

D.纤溶酶原

E.纤溶酶原激活物，包括组织纤溶酶原激活物和尿激酶

选择题

By the time I saw the angry expression on his face, I ______ exactly what I was having to face. But not for a moment ______ I should quit.

A．had known; I thought

B．have known; had I thought

C．would know; I would think

D．knew; did I think