杀虫剂田间防治试验中多是在处理后调查(),以存活的个体数或种群增加及减少百分率或数量等指标来统计防效。
参考答案:虫口密度
情景交际。
1. 当你想知道Amy怎样去上学时,你应问她:[ ]
A. How do you go home?
B. How do you go to school?
C. When do you get to school?
2. 当你想询问去中山公园的路时,你应说:[ ]
A. How can I get to Zhongshan Park?
B. How is Zhongshan Park?
C. Is Zhongshan Park far?
3. 当你告诉别人可以乘飞机去北京时,你应说:[ ]
A. You must go to Beijing by plane.
B. You can go to Beijing by train.
C. You can go to Beijing by plane.
4. 当你告诉别人你有时步行去动物园时,你应说: [ ]
A. I often go to the zoo on foot.
B. I go to the zoo by bus.
C. Sometimes I go to the zoo on foot.
急性重症胆管炎需要
A.急症手术引流胆总管B.急症手术引流腹腔C.胆囊切除D.胆囊造口E.给予解痉止痛