试样中铁含量的两次平行测定结果是0.045%和0.046%，则平均值为0.045%
参考答案：错
用正确的词填空。5%
小题1:Michael comes from ___________ ( America/ American)
小题2:—What time is the school _________（begin/over）?
—At about five o’clock.
小题3:Tom often ________ ( looks/ reads) books in the library.
小题4:Jane likes biology, and she _________ (also/ too) likes P.E and art.
小题5:It’s 12:00 o’clock now. It’s time for _______ ( lunch/ supper)
受电弓最大升弓高度是由（）来调节的。
A、下臂杆
B、推杆
C、滑环
D、升弓弹簧
