3/5-|||-C.1/3 D. 2/3
[ sqrt (3),2] -|||-C. [ -2,-sqrt (3)] D. [ -2,-sqrt (3)] cup [ sqrt (3),2]
-3sqrt (2) C. -2sqrt (3) D. -1
-dfrac (2)(3) C. dfrac (2)(3) D. dfrac (1)(9)
^2-3 C.x^2 D. ^2-2
B. dfrac {1)(2) . C. dfrac (2)(3) . D. dfrac (3)(4)
1-|||-C. 2-|||-D. 3 !,1
[单选题]新生儿脐带( )脱落。A. .2-3天B.1-2天C.3-7天D.10天左右
1-|||-NO2-|||-C. (H)_(3)COOHarrow C(H)_(3)CON(H)_(2)-|||-d. (H)_(3)C(H)_(2)OHarr
[单选题]急诊保存A.1年B.2年C.3年D.5年