图5-7-15所示外伸梁受移动载荷P作用，对梁内引起最大拉应力时，载荷移到的位置有四

绿色植物在生态系统中属于______，蜜蜂在生态系统中属于______，营腐生生活的细菌和真菌在生态系统中属于______．

正方形的边长与周长的比值是______；圆的周长与它的直径的比值是______．

对幽门螺杆菌感染阳性的消化性溃疡治疗策略中，下列哪项不正确

A．给制酸剂同时加抗菌治疗

B．给黏膜保护剂同时加抗菌治疗

C．制酸剂可用H2受体拮抗剂或质子泵抑制剂

D．制酸剂应用疗程在十二指肠溃疡应适当较胃溃疡时延长

E．抗菌药物首选一种，以2周为1个疗程

短文改错

Attention please, everyone.We have accepted the weather forecast on the radio this morning

that there will have a heavy rain tonight.Be sure shut the windows and doors until you leave your

classrooms.The sports meet that we planned to hold on tomorrow will be put off.After it becomes

fine, we'll make other announcement.We will have classes on Wednesday as usually.Since it is

colder tomorrow, please dress on more clothes in time.Those who comes to school by bike, don't

keep your umbrella open while riding.

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下列成为官定教科书和科举考试依据的理学著作是：（）

A.

B.

C.

D.