题目内容

若按电磁波来源划分，遥感传感器可分为（）。

A. 主动遥感传感器
B. 成像传感器
C. 被动遥感传感器
D. 非成像传感器

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微波遥感有哪些特点（）。

A. 能全天候、全天时工作
B. 对海洋遥感具有特殊意义
C. 对某些地物具有特殊化的波谱特性
D. 对冰、雪、森林、土壤等具有一定穿透能力
E. 空间分辨率非常高

收集、量测和记录来自地面目标地物的电磁波信息的仪器。

A. 对
B. 错

Directions: There are 10 incomplete statements here. You are required to complete each statement by choosing the appropriate answer from the 4 choices marked A) , B) , C) and D) . You should mark the corresponding letter on the Answer Sheet with a single line through the center.The classroom needs______.

A. clean
B. to clean
C. to be cleaned
D. being cleaned

Directions: There are also 10 incomplete statements here. You should fill in each blank with the proper form of the word given in the brackets. Write .the word or words in the corresponding space on the Answer Sheet.We started the attack when the enemy (cross) ______ the river.