若2x+2y=1,则x+y的取值范围是( ) A．[0,2] B．[-2,0]

案例摘要：2010版《中国药典》已于2010年10月1日起实施。《中国药典》是国家为了保证药品质量可控、保障人民群众用药安全有效而依法制定的药品法典，是药品研制、生产、经营、使用和管理都必须严格遵守的法定依据。此次颁布的《中国药典》共3部，收载药品品种4567个，比上一版药典新增品种千余例。

下列有关注射剂检查项目的叙述，哪些不符合《中国药典》规定（）

A.注射剂应进行微生物限度检查并符合规定

B.加有抑菌剂的注射剂还须进行无菌检查

C.静脉注射用无菌粉末须检查不溶性微粒

D.各品种注射液可用细菌内毒素检查代替热原检查

E.注射用无菌粉末须检查含量均匀度或装量差异

卷扬机钢丝绳放出后，至少应留在卷筒上的安全圈数不得少于（）一圈。

A.1

B.2

C.3

D.4

The first time I remember noticing the crossing guard was when he waved to me as I drove my son to school. He (31) me with a puzzle-all because he waved to me like someone does on seeing a close friend. A big, (32) smile accompanied his wave. For the next few days I tried tO study his face to see if I knew him. I didn’t. Perhaps he had (33) me for someone else. By the time I contented myself with the conclusion that he and I were strangers, we were greeting each other warmly every morning like old friends.

Then one day the (34) was solved. As I approached the school he was standing in the middle of the road (35) his stop sign. I was in live behind four cars. Once the kids had reached the safety of the sidewalk, he lowered his sign and let the cars (36) . To the first he waved and smiled in just the same way he had done to me over the last few days. The kids already had the window down and were happily waving their reply. The second car got the same (37) from the crossing guard, and the driver, a stiff-looking businessman, gave a brief, almost awkward wave back. Each following car of kids on their way to school (38) more heartily.

Every morning I continued to watch the man with interest. So far I haven’t seen anyone (39) to wave back. I find it interesting that one person can make such a difference to so many people’s lives by doing one simple thing like waving and smiling warmly. His (40) armed the start of my day. With a friendly wave and smiling fade he had changed the feelings of the whole neighbourhood.

40（）。

A. effectiveness

B. cheerfulness

C. carefulness

D. seriousness

一般缝纫机挑线方式有连杆挑线、凸轮挑线、滑杆挑线、针杆挑线，其中多针机是（）挑线。

A.挑线杆

B.滑杆

C.针杆

D.凸轮

割换板缝位置的确定及要求？