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【单选题】
How old were the earliest human fossils in Yunnan?
A.
1 million years old
B.
1.7 million years old
C.
53 million years old
D.
3 million years old
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Where were the earliest human fossils in China discovered?
A.
Chenggong County
B.
Jinning County
C.
Lufeng County
D.
Yuanmou County
【单选题】The reason why the no-load current of the primary winding is very small when the transformer is in no-load operation is ().
A.
The number of turns of the original winding is large, and the resistance is large.
B.
Leakage reactance of primary winding is very large;
C.
Transformer excitation impedance is very high.
【单选题】Which tourist attraction is related to the stories between the leader of the local minorities and the Prime Minister of Shu Kingdom?
A.
The Bronze Museum in Lijiashang
B.
The Colorful Sand Forest
C.
The Earth Forest
D.
The Stone Forest
。【单选题】Other conditions remain unchanged. If the number of turns increases by 10%, and the size of and will be ().
A.
Increase to 1.1 times,
unchanged,
increased
Increase to 1.1 times,
unchanged,
increasedB.
Increased by 1.1 times,
remained unchanged, and
decreased
Increased by 1.1 times,
remained unchanged, and
decreasedC.
Increase to 1.21 times,
unchanged,
increased;
Increase to 1.21 times,
unchanged,
increased;D.
Increased by 1.21 times,
remained unchanged, and
decreased.
Increased by 1.21 times,
remained unchanged, and
decreased.【单选题】下列有关鼻和鼻窦CT相关疾病CT检查要点的叙述,错误的是()
A.
常规CT检查主要为横轴位和矢状位扫描
B.
鼻窦炎症和外伤时冠状位扫描能更好地观察病变
C.
重建算法以骨算法为主
D.
鼻骨骨折和急性鼻窦炎可用低剂量扫描
E.
肿瘤性病变扫描范围要足够大
【单选题】Bronze is a kind of ______, which is the mixture of different metals.
A.
alloy
B.
copper
C.
lead
D.
iron