【单选题】What is the problem with mail-order?
A.
People have to work through a catalogue.
B.
People may buy more than they are able to pay for.
C.
People have to pay every month.
D.
People have to pay more money.
【单选题】一次性、几百个应力试验测试点应选择 应变片。
【单选题】胡某,男,70岁。患老年性慢性支气管炎急性发作收治入院,主诉怕冷。欲为该患者灌一热水袋取暖。使用热水袋适宜的水温是:
【单选题】04-68垂直滑动门层门开始关闭之前,轿门至少已关闭到( )。
【单选题】垂直滑动层门开始关闭之前,轿门至少已关闭到()。
【单选题】《乐府诗集 • 敕勒歌》中“天似穹庐,笼盖四野。”是我国古代那种宇宙学说的写照?