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【单选题】
下列物质的用途利用了水解原理的是A.
明矾用作净水剂
B.
纯碱用于除去粗盐中的钙离子
C.
四氧化二氮用作火箭燃料的氧化剂
D.
氢氧化铝 用于中和过多的胃酸
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皮皮学刷刷变学霸
举一反三
【单选题】Mary is not a(n)_________,just a(n)__________ . [ ]
A.
friend ; acquaintances
B.
acquaintances ; friend
C.
friend ; acquaintance
D.
acquaintance ; friend
【单选题】Henry,____ Mary and Tom, is coming to China for a visit. Which is wrong?
A.
together with
B.
like
C.
and not
D.
but in addition to
【单选题】Mary is a(n) _______ customer, so the waiter knows her likes and dislikes.
A.
usual
B.
ordinary
C.
common
D.
regular
【单选题】Mary is______hardworking than her sister, but she failed in the exam.
A.
no less
B.
no more
C.
not less
D.
no so
【简答题】Mary is a(n) ____________ actress.
【单选题】—Mary is a(n) painter . —So she is . She won a national award at the age of fifteen .
A.
delighted
B.
gifted
C.
normal
D.
accurate
【单选题】Mary is from N0.1 Vocational school. She is a__________.
A.
teacher
B.
doctor
C.
engineer
【单选题】雄激素的结构特征是（ ）。
A.
以雌甾烷为母体，C3位有酮基，C4位有双键，C17位有β-羟基
B.
以雄甾烷为母体，C3位有酮基，C4位有酮基，C17位有β-羟基
C.
以雄甾烷为母体，C3位有酮基，C4位有双键，C17位有a-羟基
D.
以雄甾烷为母体，c3位有酮基。C4位有双键，C17位有一个羟基
E.
以雄甾烷为母体，C3位有酮基，CA位有双键，C17位有β羟基
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