多轴飞行器常用螺旋桨的剖面形状是()
A.对称型
B.凹凸型
C.S型
参考答案:B
– Did you enjoy the book?
--- Yes, it was so interesting that I couldn’t _____ it.
A.get rid of
B.break away from
C.keep away from
D.tear myself away from
拔牙时,清毒口内黏膜及消毒麻醉药安碚所使用碘酊浓度正确的是()。
A.消毒口内黏膜和安碚的碘酊浓度应为2%
B.消毒口内黏膜和安碚的碘酊浓度为1%
C.消毒口内黏膜的碘酊浓度应为1%,消毒安碚的碘酊浓度应为2%
D.消毒口内黏膜的碘酊浓度应为1%,消毒安碚的碘酊浓度应为2%
E.以上说法都不对