将学生表中所有外语在85分以上的男同学记录复制到一个新的文件NEW.DBF中应执行命

关于双胎妊娠的诊断，下列说法正确的是（）

A.双胎最早于孕4周时发现两个妊娠囊

B.B超检查孕9周可见两个胎儿心管搏动

C.用多普勒胎心监护仪，孕10周可听到两个频率不同的胎心

D.产科检查可触及多个小肢体，同一时间听到速率不同的两个胎心率，每分钟相差10次以下

E.早孕反应较轻

以下哪一项是单纯额窦前壁骨折的临床表现（）。

A.硬膜下血肿

B.颅内积气

C.脑脊液鼻漏

D.脑水肿

E.前额部塌陷

如图，ACB是一光滑的、足够长的∧形框架固定在竖直平面内的，其CA、CB边与竖直方向的夹角均为θ．P、Q两个轻质小环分别套在CA、CB上，两根细绳的一端分别系在P、Q环上，另一端和一绳套系在一起，结点为O．将质量为m的钩码挂在绳套上．OP、OQ两根细绳拉直后的长度分别用l₁、l₂表示，受到的拉力分别用F₁和F₂表示（　　）

A．若l₁＜l₂，则两绳受到的拉力F₁＜F₂

B．若l₁＜l₂，则两绳受到的批力F₁＞F₂

C．若l₁＞l₂．则两绳受到的拉力F₁＜F₂

D．若l₁＞l₂，则两绳受到的拉力F₁=F₂

男性，23岁，因骑跨伤4小时，排尿通畅但 * * 痛。查体：会阴部有青紫瘀斑，无血肿， * * 口有血迹。该患者最好选择（）

A. * * 探查

B.抗炎对症治疗

C.留置导尿2周

D.留置导尿1周

E.耻骨上膀胱造瘘

Recently, I flew to Las Vegas to attend a meeting. As we were about to arrive, the pilot announced with apology that there would be a slight (16) before setting down. High desert winds had (17) the airport to close all but one runway. He said that we would be (18) the city for a few minutes waiting to (19) . We were also told to remain in our seats meanwhile with our seat belts fastened (20) there might be a few bumps(颠簸). Well, that few minutes turned into about four-five minutes, including a ride that would make a roller coaster(过山车) (21) by comparison. The movement was so fierce that several passengers felt (22) and had to use airsickness bags. As you might guess, that’ s not a good thing to have happen in a(n) (23) space because it only (24) to increase the discomfort of the situation.

About twenty minutes into the adventure, the entire airplane became very (25) There was now a sense of anxiety and fear that could be (26) noticed. Every passenger simply held on for dear life …except one. A (27) was having a good time！ With each bump of the (28) , he would let out a giggle (咯咯地笑)of delight. As I observed this, I (29) that he didn’t know he was supposed to be afraid and worried about his (30) . He neither thought about the past nor about the future. Those are what we gown--ups have learned from (31) . He was (32) the ride because he had not yet been taught to fear it. Having understood this, I took a deep breath and (33) back into my seat, pretending I was (34) on a roller coaster. I smiled for the rest of the flight. I even (35) to giggle once or twice, much to the chagrin(随恼) of the man sitting next to me holding the airsickness bag.

19（）

A.attempted 

B.managed 

C.wanted 

D.decided