在光电比色计的光源是：（）。
A.钨丝灯
B.低压氢灯
C.碘钨灯
D.氢灯
参考答案：A, C
9. –You should have apologized to them for not ______ at the party.
--I ________ but they didn’t forgive me anyway.
A．coming up; did
B．turning up; did
C．showing up; should have
D．appearing; should
装移机工单派单到装维人员后，装维人员应在（）小时内使用1183112语音平台联系客户，完成预约。
A.12
B.24
C.36
D.48
