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【多选题】
以下那个宝石的硬度为9的宝石有( )。A.
蓝宝石
B.
电气石
C.
红宝石
D.
莫桑石
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【简答题】The existence of microorganisms was hypothesized for many centuries before their actual discovery. They were supposed to live in earth, water, and air, and cause serious diseases. It was not until the...
【单选题】It was not until yesterday the business negotiation finally came to a successful end.
A.
when
B.
that
C.
since
D.
after
【单选题】It was not until last July_______ we started to distribute e-readers and launched an e-book store.
A.
that
B.
who
C.
which
D.
whom
【单选题】某基金会要决定的下列事项中,哪些需要出席理事三分之二以上通过?( )。
A.
修改基金会职员管理制度
B.
修改基金会筹款规则
C.
引进某外籍人才，出任基金会秘书长
D.
基金会在北京的常规筹款活动
【简答题】钢中硫和氧的含量超过限值时,会使钢材
【简答题】It was not until 1835 however that the phenomenon (give) _______ a name.
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