计算2sin30°+3tan30°•tan45°=______.
2sin30°+3tan30°•tan45°=2×12+3×33×1=1+3;
故填:1+3.
When you rewrite the paragraph, I advise you to leave out __________ is thought unnecessary or misleading.
A.what
B.that
C.those
D.which
根据《移动通信工程钢塔桅结构设计规范》(YD/T5131—2005),移动通信钢塔桅的抗震设防类别为()。
A.甲
B.乙
C.丙
D.以上都可以