My brother ___ in his school for two years. [ ]
A. were
B. has been
C. is
D. is being
答案:B
对于尿瘘的预防,下列描述恰当的是()
A.经 * * 助产后要常规检查泌 * * 有无损伤
B.经 * * 助产前应先导尿
C.可疑损伤者,产后留置尿管长期开放5-7天
D.妇科手术中明确解剖位置,防止输尿管损伤
一般航迹舵在自动校正风流压影响的航向修正量大于()时应同时发出报警指示。
A.5°
B.10°
C.15°
D.20°