一般情况下,光滑面约束的约束反力可用一个沿()方向的力来表示。
参考答案:光滑面外法线
根据括号中所给的汉语写出英文单词,使句子意思完整正确。
小题1:Nowadays, few young people want to buy _________(收音机). They can use their mobile phones to listen to music.
小题2:The hall was (拥挤的) because many students and their parents came to attend the farewell party.
小题3:I live on the (第二十一) floor of a tall building in the centre of the city.
小题4:They kept working in the field though it rained ___________ (猛烈地).
小题5:My family has _______(计划) to go on a trip to Hainan this summer vacation.
小题6:The reporters gathered around at once in order to interview the (幸存者) relatives.
既能平肝阳,又能熄肝风的药物是()
A.珍珠
B.钩藤
C.天麻
D.全蝎
E.羚羊角