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【单选题】
腰椎间盘突出症的病因，哪项不正确A.
高处坠落伤是腰椎间盘突出症的常见病因
B.
发病无遗传因素
C.
椎间盘退行性变是基本因素验
D.
腰椎融合有利于预防相邻节段腰椎间盘突出
E.
老年人发病率高是因为退变发生于50岁以后
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【单选题】The law of constant composition says __________.
A.
that the composition of a compound is always the same
B.
that all substances have the same composition
C.
that the composition of an element is always the same
D.
that the composition of a homogeneous mixture is always the same
E.
that the composition of a heterogeneous mixture is always the same
【单选题】There are some spelling mistakes in your composition , but_________your composition is good. [ ]
A.
as a whole
B.
on the whole
C.
on one hand
D.
on the other hand
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A.
企业内部网
B.
企业外部网
C.
局域网
D.
广域网
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