生理盐水的浓度为（）。 A: 0杄09％ B: 0杄9％ C: 7％ D: 0杄7％

You are writing an email to inform a colleague about a meeting.Which is the best subject? A: Monthly Sales Meeting Tomorrow at 09:00 AM B: meeting C: Sales meeting D: no subject

We can enjoy a fashion show _____. A: at 7:30 pm on 7 March B: at 7:30 am on 7 March C: at 7:30pm on 8 March

聊天群组“ Big Big Club”是甚么时候创建的?() A: 2020/09/17 10:34; B: 2020/09/18 10:34; C: 2020/09/18 08:35; D: 2020/09/18 07:34; E: 2020/09/18 09:34

Interview One The peak for text messaging is between ______. A: 10:30 pm and 11:00 pm B: 7:30 am and 8:00 am C: 10:30 am and 11:00 am D: 8:00 pm and 10:30 pm

表达式(^2012/09/18)-(^2012/09/20)的值是

表达式{^2000/09/18}-{^2000/09/20}的值是（ ）。

Which of the following time is proper if you want to make an A: ? B: at 7:00 am C: at 4:00 pm D: at the midnight E: at 4:00 am

[tex=1.071x1.143]aM09ObBhib7/5UQ2UEDoaA==[/tex]介子是一不稳定粒子, 平均寿命是 [tex=4.929x1.357]A5LpnAhrq9pLSIbI/Vnvu5u//Er43xLNeY5J5mCoTC4=[/tex] (在它自己参考系中测得).[tex=1.071x1.143]aM09ObBhib7/5UQ2UEDoaA==[/tex]介子在衰变前运动了多长距离?

上证50ETF期权合约的收盘竞价时间为（）。 A: 上午09：15～09：30 B: 上午09：15～09：25 C: 下午13：30～15：00 D: 下午14：57～15：00