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【判断题】
行星轮系中的系杆既有公转也有自转A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】He doesn't know the city very well, because this is the first time he _____ here. [ ]
A.
came
B.
has been
C.
come
D.
am coming
【单选题】下列说法不正确的是( )
A.
可降解的有机物分解过程分碳化阶段和硝化阶段
B.
可降解的有机物一部分被微生物氧化,一部分被微生物合成细胞
C.
BOD是碳化所需氧量和硝化所需氧量之和
D.
BOD是微生物氧化有机物所消耗的氧量与微生物内源呼吸所消耗的氧量之和
【单选题】Every time he came to me, he tell me he was busy.
A.
would
B.
is going to
C.
will
D.
is to
【单选题】He started to work dilligently _____ he came up with the idea of hybrid rice for the first time in the 1960’s.
A.
at once
B.
the moment
C.
for the moment
D.
in no time
【单选题】_______ the manager came to Beijing on business, he would visit his old friends there. [ ]
A.
Every time
B.
Many times
C.
In no time
D.
All the time
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