集合A={x|C52x<6}的真子集的个数是( )
A.1
B.3
C.7
D.15
由C52x<6,可得x=0或x=2,
所以集合A={0,2},它的真子集有3个.
故选B.
----I _____to go for a walk.
-------But I_____ going shopping.
A.would like; feel like
B.feel like; feel like
C.feel like; would like
D.would like; would like
将硫酸钠和氯化钠的固体混合物26.5g溶于92.8g水中,加入104g质量分数为20%的氯化钡溶液,恰好完全反应,滤出沉淀(过滤时损耗不计).求:
(1)原混合物中硫酸钠的质量;
(2)滤液中溶质的质量分数.