皮皮学，免费搜题
登录
搜题
【单选题】
2019年1月3日，嫦娥四号探测器在月球背面成功着陆，并与玉兔二号巡视器顺利分离，实现了多个国际首次。对此，下列说法不正确的是()A.
首次进行了月基低频射电天文观测
B.
首次在月球背面软着陆和巡视探测
C.
首次实测了月球表面浅层月壤温度
D.
首次实现地球和月球背面的中继通信
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】A group of mice was released into a large field to which no other mice had access. Immediately after the release, a representative sample of the mice was captured, and the fur color of each individual...
A.
The allele for gray fur color is unstable, and over twenty years most of those alleles mutated to become alleles for black fur.
B.
The field was composed primarily of light-colored soil and little vegetation, affording gray mice protection from predators.
C.
Sexual selection led to increased mating frequency of black and brown versus gray and brown.
D.
The gray mice were hardest to capture and so were underrepresented in the twenty-year sample.
【单选题】如图所示,为Y-△降压起动电路,若与KT线圈串联的常闭辅助触点因故不闭合,其他均正常,则在合上QS三相电源开关,按下SB2后,电动机会______。
A.
电动机只能Y起动和运转
B.
电机仍能Y降压起动，△运转
C.
电机△起动，Y运转
D.
FU4、FU5熔断
【简答题】提出'教育即生活'、'教育即生长'的教育家是（ ）。
【单选题】A 60-year-old previously healthy man sees his physician because he feels feverish and weak. He reports passing dark-colored urine on several occasions during the past month but has no urinary frequenc...
A.
Straining of urine for calculi
B.
Urine microbiologic culture
C.
Abdominal CT scan for renal mass
D.
Collection of a 24-hour urine specimen for protein
E.
Percutaneous renal biopsy
【单选题】The crystal thickness and transducer frequency are related. Lower the crystal thickness
A.
The lower the frequency
B.
The higher the frequency
C.
There is no appreciable affect
D.
None of the above
【简答题】杜威提出教育即生长 、教育即生活 、( )。
【简答题】一个完整的数字博物馆至少包括: 1 2 3
相关题目：