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【单选题】
The reason why he hasn’t come is _______. A. because his mother is ill B. because of his mother’s being ill C. that his mother is ill D. for his mother is illA.
because his mother is ill
B.
because of his mother’s being ill
C.
that his mother is ill
D.
for his mother is ill
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【简答题】钾长石的化学组成是__________。
【单选题】下列那一行为构成对知识产权的侵犯?()
A.
刘某明知是盗版书籍儿购买并阅读
B.
李某明知道是盗版软件而购买并安装使用
C.
五湖公司明知是假冒注册商标的商品而购买并经营性使用
D.
四海公司明知是侵犯外观设计专利权的商品而购买并经营性使用
【简答题】自然界中纯钾长石较少,大多数是钾钠长石的混熔体,因而实用的长石中都含有一定量的钠长石,故而一般要求长石中纯钠长石的量在 以下。从化学组成来看,长石中的钾钠比应在 以上为好。