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【单选题】How exactly, does science work How do scientists go about doing science Ordinarily we think science proceeds in a straight-forward way. Ideally scientists make observations, formulate hypotheses (假设),...
A.
The research methods used by scientists.
B.
Observation and human perception variation.
C.
The relation between hypothesis and observation.
D.
The human perceptual mechanism.
【多选题】《变电评价管理规定第3分册组合电器精益化评价细则》：组合电器本体增爬措施（伞裙、防污涂料）完好，其中防污闪涂料涂层应满足什么条件？
A.
无尘
B.
无剥离
C.
无水渍
D.
无破损
【单选题】在Excel中，假设B1、B2、C1、C2单元格中分别存放1、2、6、9，SUM(B1：C2)和AVERAGE(B1，C2)的值等于()。
A.
18，5
B.
10，5
C.
18，10
D.
10，10