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判断题

易烧性愈好，煅烧的温度愈低。
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单项选择题

Suppose your blood is O blood group. This means that ()

A．neither agglutinogens A and B are present on your red blood cells,
B．there are both anti-A or anti-B antibodies in your plasma,
C．your blood is Rh+,
D．you are theoretically the universal donor,
E．all of the above.