A.一般情况下,必须大于 30%
B.在使用上完全等价,只要一个符合要求就可以
C.都表示测量系统的重复性和再现性
D.B和C
第1题
A.They want to make sure if chocolate is really beneficial.
B.They want to see how chocolate improve health.
C.They want to know why people love to eat chocolate.
D.They want to find out the benefits of pure flavanols.
第4题
A.By studying the data got from the survivors who had experienced atomic radiation.
B.By carrying out the experiments in the lab.
C.By studying the features of the experiments.
D.By studying the features of the erperiments.
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