sin(-510°)等于______.
sin(-510°)=sin(-510°+360°)=sin(-150°)=-sin150°=-12
故答案为-12
— I used to smoke, but I've quit the habit.
— ________!Now, can you help me stop drinking?[ ]
A. Good for you
B. Oh come on
C. You can't be serious
D. You must be joking
“……当(英)舰突破虎门要塞,沿江北上,开向马乌涌(炮台时),(珠)江两岸数以万计的当地居民,平静地观看自己的朝廷军队与我(英)军的战事,好像观看两个不相干的人争斗。(《鸦片战争——一个帝国的沉迷和另一个帝国的堕落》)这一奇怪现象突出说明()
A.清政府己经失去人民支持
B.中国国内社会矛盾尖锐
C.民众对世界情况一无所知
D.民族观念民族意识淡漠