皮皮学，免费搜题
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搜题
【单选题】
在不加样品的情况下，用测定样品同样的方法、步骤，对空白样品进行定量分析，称之为A.
对照试验
B.
空白试验
C.
平行试验
D.
预试验
E.
交叉试验
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Smith did the only ______ thing by asking the Indians for food and shelter in their village.
A.
sensitive
B.
sentimental
C.
sensible
D.
sensational
【单选题】由一简支梁的弯矩图(如图所示)得出梁在左、中、右三段上的剪力大小和正负依次是 。
A.
20KN，0，-10KN
B.
10KN，0，-20KN
C.
-10KN，0，20KN
D.
-20KN，0，10KN
【单选题】I looked up the word in a dictionary to ______ its spelling.
A.
verify
B.
identify
C.
confirm
D.
reinforce
【单选题】I looked up and noticed a snake ________ its way up the tree to catch its breakfast.
A.
to wind
B.
winding
C.
wind
D.
wound
【单选题】Many children, ________ parents are away working in big cities, are taken good care of in the village. [ ]
A.
their
B.
whose
C.
of them
D.
with whom
【单选题】I looked up and noticed a snake ______ its way up the tree to catch its breakfast.
A.
to wind
B.
wind
C.
winding
D.
wound
【简答题】来源于上皮组织的恶性肿瘤是 查看材料
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