下列对根瘤菌的叙述,正确的是[ ]
A.根瘤菌在植物根外也能固氮
B.根瘤菌离开植物根就不能存活
C.土壤淹水时,根瘤菌固氮量减少
D.大豆植株生长所需要的氮都来自根瘤菌
答案:C
患者女,60岁,左下21和右下12缺失,左上3残根,已做根管治疗,余留牙健康,前牙舌侧牙槽骨为斜坡形
取印模时,应取()
A.解剖式印模
B.功能性印模
C.一次印模
D.无压力印模
E.静态印模
根据句意和首写字母补全单词。
小题1:You must be c______ when you cross streets. There are too many cars.
小题2:Our class is organizing a talent show to r_______ some extra money for charity.
小题3:If you go aboard alone, you will m______ your family.
小题4:Would you mind c_____ the dinner?
小题5:I saw someone cooking in the k________ when I passed it.