咖啡有三个主要的原种:
参考答案:
阿拉比卡、罗布斯塔、利比里卡
Perhaps the beautiful beach is the island’s main ______. It is always full of tourists.
A.land
B.visit
C.attraction
D.tour
对于难溶盐MX,其饱和溶液中M+和X-浓度之间的关系为Ksp=c(M+)•c(X-),现将足量的AgCl分别放入下列物质中,AgCl的溶解度由大到小的顺序是( )
①20mL0.01mol•L-1KCl溶液;②30mL0.02mol•L-1CaCl2溶液;③40mL0.03mol•L-1HCl溶液;④10mL蒸馏水;⑤50mL0.05mol•L-1AgNO3溶液
A.①>②>③>④>⑤
B.④>①>③>②>⑤
C.⑤>④>②>①>③
D.④>③>⑤>②>①