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【单选题】
探冰棒、压差式结冰信号器和放射性同位素结冰信号器（）
A.
均属于直观式结冰信号器
B.
均属于自动结冰信号器
C.
前两者属于自动结冰信号器，后者属于直观式结冰信号器
D.
前者属于直观式结冰信号器；后两者属于自动结冰信号器，并自动除冰
参考答案：
参考解析：
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【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
thus
B.
however
C.
so
D.
but