一品红又名圣诞红，是冬季观赏花之一，其主要观赏部位是（）
A、花序
B、苞片
C、茎干
D、果实
参考答案：B
A client reveals to the nurse that he’s sexually impotent. Which statement best expresses what the nurse should understand her client to mean（）
A. He’s disinterested in sexual intimacy.
B. He’s unable to attain or retain an erection.
C. His ejaculate is void of sperm.
D. His semen isn’t potent enough to impregnate.
TOSI锅炉空气加热器所用蒸汽来源于哪？
