A client with testicular cancer is scheduled for a right orchiectomy. The day before surgery, the client asks the nurse whether losing a testicle will have influence on his manhood. Which of the following facts about orchiectomy should form the basis for the nurse’s response

A. Testosterone levels are decreased.
B. Sexual drive and libido are unchanged.
C. Sperm count increases in the remaining testicle.
D. Secondary sexual characteristics chang

某化学兴趣小组的同学为了体验“工业冶炼金属”的过程。在实验室做了CO还原CuO的实验，他们称得装有CuO粉末的试管重42g，反应完全后，恢复到室温称量，试管和固体残留物共重40.4g，并收集到CO₂ 4.4g，请你和他们一起计算：

（1）42g - 40.4g = 1.6g，1.6g表示                       的质量。

（2）该反应制得铜的质量为多少克？