手工空气喷涂,喷嘴到被喷涂物面的距离一般控制在()范围内。
A.50~100mm
B.100~150mm
C.150~250mm
D.300~500mm
参考答案:C
Upon arriving home from a business trip, dad asked mum about my academic performance at high school and then _____ of my little sister, who was in junior school.
A.one
B.it
C.that
D.the one
1号机照明变压器的额定容量是()kVA。
A.2500;
B.2000;
C.1600;
D.800。