桂林人喜食酸菜,但酸菜若未腌透,会富含亚硝酸钠(NaNO2),食用后有损人体健康.亚硝酸钠中氮元素的化合价为 .
+3
根据短文内容和首字母提示完成所缺单词。
Mrs. White loves flowers very much and she has a small but beautiful garden. In summer the flowers
are very n_____ (1). One day, the doorbell rings and she o_____ (2) the door. She goes out and s_____ (3) a boy outside. He is about seven years old and has a lot of f_____ (4) in his hands.
"I'm selling flowers," he says, "Do you w_____ (5) any? They are very cheap. I pick t____ (6) this
morning."
"My boy," Mrs. Green answers, " I have a lot of flowers in my garden. S____ (7) I needn't pay for
them."
"Oh, no, you don't have any flowers in your g_____ (8) now," says the boy. "They are a___(9) here
in my h___ (10)."
最容易导致上肢缺血性肌挛缩的骨折是()。
A.前臂双骨折
B.Colles骨折
C.桡骨小头骨折
D.尺骨鹰嘴骨折
E.肱骨髁粉碎性骨折