问题
选择题
He must have passed this way, _____here are his footprints.
A．since
B．because of
C．now that
D．for
答案
答案：D
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He must have passed this way, _____here are his footprints.
A．since
B．because of
C．now that
D．for
答案：D
=________Ω（保留两位有效数字）。由于电表是非理想仪表，实验中电阻的测量值略________（选填“大于”或“小于”）真实值。