《工业金属管道工程施工及验收规范》规定，阀门的壳体实验压力不得不小于公称压力的（ ）

以下说法正确的是[ ]

A. 植物的光合作用有益于保护环境

B. 废水直接排入江河有利于鱼类生长

C. 凡是“绿色食品”均不含化学物质

D. 吸烟既危害人体健康，又污染环境

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

小题1: Many students feel stressed around big moments in their lives like during final exams or when applying to college. Stress can be a pretty dangerous thing, because it can cause you to become sick.. Here are some ways to cope with stress:

Laugh   Laughter is really one of the best medicines. When things get stressful, do things that make you laugh. Watch a funny movie. 小题2:  Chat with friends and family.

Take a Deep Breath  Breathing is a great way to reduce your stress. Taking deep breaths or doing breathing exercises may seem silly, but it do help you relax and clear up your mind.

Plan Ahead  Most students tend to study hard when test time comes close or do their homework right before it is due. However, having a plan will do a lot to decrease your stress.  小题3:   

Sleep  Sleep is another great tool in reducing stress. 小题4: You should be getting at least 6 to 8 hours of sleep each night. As you know, a lack of sleep can be bad for your health.

Learn to Say “No”   小题5: So there are times when it is okay to say “no” to the requests of friends, families and teachers. If it is going to add too much to your stress level, just say so.

A．There are a lot of ways to deal with stress.

B．Sometimes life gets pretty stressful.

C．Read an interesting book.

D．Some stress comes from doing everything you’re asked to do.E. It is essential that we allow our bodies to recover from daily stress.

F. Give yourself the appropriate amount of time to complete tasks, and break those tasks down into manageable portions.

G. You can lose yourself for a while in the music.

某框架一剪力墙结构，房屋高度50.1m，地下2层，地上13层，首层层高6.0m，二层层高4.5m，其余各层层高均为3.6m。纵横方向均有剪力墙，地下一层板顶作为上部结构的嵌固端。该建筑为丙类建筑，抗震设防烈度为8度，设计基本地震加速度为0.2g，1类建筑场地。在基本振型地震作用下，框架部分承受的地震倾覆力矩小于结构总地震倾覆力矩的50%。各构件的混凝土强度等级均为C40。

与截面700mm×；700mm的框架柱相连的某截面为400mm×；600mm的框架梁，纵筋采用HRB335级钢φ，箍筋采用HPB235级钢φ；其梁端上部纵向钢筋系按截面计算配置。假设该框架梁抗震等级为三级，试问，该梁端上部和下部纵向钢筋面积（配筋率）及箍筋按下列（）项配置时，才能全部满足《高层建筑混凝土结构技术规程》（JGJ3-2010）的构造要求。

提示：①下列各选项纵筋配筋率和箍筋面积配筋率均符合《高规（混凝土）》第6.3.4条第1款和第6.3.2条第2款中最小配筋率要求。

②梁纵筋直径均不小于φ18。

A．上部纵筋A_s上=5680mm²，p_上=2.70%；下部纵筋A_s下=4826mm²，ρ_下=2.30%；四肢箍筋中10@100

B．上部纵筋A_s上=3695mm²，ρ_上=1.76%；下部纵筋A_s下=1017mm²，ρ_下=0.48%；四肢箍筋中8@100

C．上部纵筋A_s上一5180mm²，ρ_上=2.47%；下部纵筋A_s下=3079mm²，ρ_下=1.47%；四肢箍筋中8@100

D．上部纵筋A_s上=5180mm²，ρ_上=2.47%；下部纵筋A_s下=3927mm²ρ_下=1.87%；四肢箍筋中10@100

治疗白喉的首选抗生素是（）

A.青霉素

B.红霉素

C.磺胺类

D.头孢类

E.氨基糖苷类