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【单选题】
若已知任何物质中各元素化合价总和为零．则当氢为+1价时，H 2 O 2 中O的化合价为（ ）A.
+1
B.
-1
C.
0
D.
-2
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举一反三
【单选题】The main idea of the last paragraph is that______
A.
we can do nothing about it unless we get into print
B.
we should take responsibility to the language if necessary
C.
our conversation has little effect on the situation because we haven't got into print
D.
a great mass of people will accept what the press prints so that we can encourage the good
【单选题】已知有变量data1定义如下: union data { int i; char ch; float f; } data1; 则变量data1所占的内存存储空间可表示为。
A.
sizeof(int)
B.
sizeof(char)
C.
sizeof(float)
D.
sizeof(int)+sizeof(char)+sizeof(float)
【简答题】We can measure the amount of water in a pot, but we can't measure its heat. We don't have an instrument for that.
【单选题】There is little we can do about it,_____? [ ]
A.
is there
B.
can't we
C.
isn't there
D.
can we
【单选题】We can infer from the first paragraph that ______.
A.
BBSRC is not in favor of GE biotechnology
B.
Lord Sainsbury is a well-known scientist himself
C.
most supermarkets in Britain sell GE foods
D.
Burke is not aware of public ignorance about GE foods
【单选题】预收账款不多的企业，可以不设“预收账款”，而将预收的款项记入( )。
A.
“应付款项”科目的借方
B.
“应付款项”科目的贷方
C.
“应收款项”科目的借方
D.
“应收款项”科目的贷方
【单选题】已知公用体变量data1的定义如下: union data { int i; char ch; float f; } data1; 则变量data1所占的内存存储空间大小可表示为( )
A.
sizeof(int)
B.
sizeof(char)
C.
sizeof(float)
D.
sizeof(int)+sizeof(char)+sizeof(float)
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