【单选题】British scientists said teenagers are programmed to take risks because they enjoy the thrill of
A.
30. British scientists said teenagers are programmed to take risks because they enjoy the thrill of dangerous situations________ others. A.more than
【简答题】求值:sin 2 45°-cos60°+tan60°?cos 2 30°.
【单选题】The plane will take ______ at 17:30.
【简答题】计算:(1)sin 2 45°-cos60°+tan60°cos 2 30°; (2) tan60°-sin60° cos 2 45°- 1 2 tan45°+tan60° .
【单选题】下面关于人工髋关节置换术后患者注意事项说法错误的是()。
A.
患者坐位、站立或平卧时均应避免交叉腿和膝(翘二郎腿、盘腿),避免跪姿
B.
平卧时双大腿之间一定要放枕头,以保持双腿分开。侧卧时双腿间应夹枕,避免过度内旋造成脱位
D.
选择一个牢固、直背、有扶手的椅子,有利于站起或坐下,从坐到站立时,应先向椅子边缘滑动,然后拄拐站起
【简答题】计算:sin30°tan45°-cos 2 30°tan 2 30°.
【简答题】计算 si n 2 60°-tan30°cos30° tan45°-4co s 2 30° .
【单选题】—The trousers are $30. —I’ll take______. [ ]