皮皮学，免费搜题
登录
搜题
【单选题】
在监控系统中，如果要监控近距离大场面，就应选择（ ）镜头。A.
自动变焦
B.
固定焦距
C.
长焦距
D.
广角
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】W: Thanks for all the support and help you offered in finishing this project. Shall we go to a concert now?M: I'd love to. And let,s have dinner after that.What will the speaker probably do next?
A.
Go to a concert.
B.
Finish a project.
C.
Go out to eat
D.
Offer some help
【单选题】Now all the speaker has to do is to .
A.
figure out a list of the programs she wants to watch
B.
click the programs she in interested in on the list on the screen
C.
see those programs on the screen
【简答题】如图，B地在A地的正东方向4 km处，C地在B地的北 偏东30°方向2 km处，河流的沿岸PQ（曲线）上任意一点 到A的距离比到B的距离远2 km．．现要在曲线PQ上选一处 M建一座码头，向B、C两地转运货物．那么这两条公路MB、 MC的路程之和最短是____ km
【单选题】如图，B地在A地的正东方向4km处，C地在B地的北偏东30°方向2km处，河流的没岸PQ（曲线）上任意一点到A的距离比到B的距离远2km。现要在曲线PQ上选一处M建一座码头，向B、C两地转运货物，经测算，从M到B、M到C修建公路的费用分别是a万元/km、2a万元/km，那么修建这两条公路的总费用最低是 [ ]
A.
(2 -2)a万元
B.
5a万元
C.
(2 +1) a万元
D.
(2 +3) a万元
【单选题】Passage Three.mp3: Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. 18. According to ...
A.
insure all your expensive things.
B.
lock doors when going out.
C.
lock windows at night.
D.
take all necessary precautions.
【单选题】Questions 38 to 40 are based on the following passage. A t the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. 38. According to the speaker, safet...
A.
insure all your expensive things
B.
lock doors when going out
C.
lock windows at night
D.
take all necessary precautions预防 警惕
【简答题】如图，B地在A地的正东方向4km处，C地在B地的北偏东30°方向2km处，河流的沿 岸PQ（曲线）上任意一点到A的距离比到B的距离远2km．现要在曲线PQ上选一处 M建一座码头，向B、C两地转运货物．经测算，从M到B、M到C修建公路的费 用分别是a万元∕km、2a万元／km，那么修建这两条公路的总费用最低是_______万元
【简答题】A 在B的________方向 河流流向大致为_____________ 山脉走向_____________
相关题目：