What is the measure of the angle formed by the minute and hour hands of a clock at 1:50?

听力原文： There are four types of college degrees, starting with the associate degree. The associate takes about two years to complete when one is enrolled full time. The bachelor's degree takes four years when one is enrolled full time with the master's taking an additional one to two years, and the doctor's three to four years. The associate degree may be substituted for the first two years of a bachelor's degree if it is a transfer degree. Not all associate degrees are designed for transfer. Some are technical degrees which are called terminal degrees, which means they do not count toward a bachelor's. The bachelor's is normally required before one can work at the master's level. Likewise, the master is normally required before one can work at the doctor's level. The number of credit hours of university degree programs varies from one school to another. In general, the AA is 60 credit hours or 95 quarter hours. The BA (or BS) is 120 credit hours or 185 quarter hours. The MA is 30 credit hours or 45 quarter hours and the PhD is 60 to 72 credit hours or 95 to 120 quarter hours.(36)A．The Bachelor's degree.B．The Associate degree.C．The Master's degree.D．The Doctor's degree. 点击查看答案

含NH3体积分数1．5％的空气一NH3混合气，在20℃下用水吸收其中的NH3，总压为203kPa。NH3在水中的溶解度服从亨利定律。在操作温度下的亨利系数E=80kPa。试求氨水溶液的最大浓度，kmol(NH3)／m3(溶液)。 点击查看答案