氮气泄漏窒息，进行人工呼吸时，按压部位位于胸骨中下（）处。
A、中下1/3
B、中下1/2
C、中上1/3
D、中上1/2
参考答案：A
（6分）、向50ml0.018mol/L的AgNO3溶液中加入50ml0.02mol/L的盐酸，生成了沉淀。如果溶液中C(Ag+)和C(Cl-)的乘积是一个常数，C(Ag+)· C(Cl-)=1.0×10-10，当溶液中C(Ag+)· C(Cl-)>常数，则有沉淀产生，反之沉淀溶解，求
（1）沉淀生成后溶液中C(Ag+)是多少？（3分）
（2）如果向沉淀生成后的溶液中再加入50mL0.001mol/L的盐酸，是否产生沉淀，为什么？（3分）
While making rounds in a senior citizens’ housing complex, the visiting nurse discovers one of her clients sobbing in her darkened apartment. On questioning the client, an 85- year-old widow, the nurse learns that her pet cat of 15 years had been put to sleep the day before. What’s the nurse’s best response ？（）
A．"It shouldn’t be hard to find another cat. You’ll feel better once you have another pet. "
B．"It was only a cat. Why are you allowing yourself to be so upset It would be different if it were a person. "
C．"I’m so sorry that your pet had to be put to sleep. I know how important your cat was to you. "
D．"It’s probably best for the cat because it was so old and ill. "
