题干
He not only helped his own family, but he also _________ a helping hand to many other men less fortunate than himself.
A：brought out
B：took out
C：gave out
D：held out
答案(点此获取答案解析）
D
Ag+ + Cl-，25℃时氯化银的KSP=1.8×10-10。现将足量的氯化银分别放入下列选项的溶液中，充分搅拌后，相同温度下，银离子浓度最小的是（ ）