问题
单项选择题
关于钼锝发生器，下列说法中错误的是：()
A．裂变型99Mo- 99 mTc发生器以Al2O3为吸附柱
B．凝胶型99Mo-99 mTc发生器以ZrOMoO4为吸附柱
C．凝胶型发生器淋洗后必须保持干柱
D．99Mo的半衰期约60 h
E．裂变型发生器淋洗后必须保持干柱
答案
参考答案：C
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关于钼锝发生器，下列说法中错误的是：()
A．裂变型99Mo- 99 mTc发生器以Al2O3为吸附柱
B．凝胶型99Mo-99 mTc发生器以ZrOMoO4为吸附柱
C．凝胶型发生器淋洗后必须保持干柱
D．99Mo的半衰期约60 h
E．裂变型发生器淋洗后必须保持干柱
参考答案：C
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| I want to be the first woman president (总统) of the United States when I grow up. 1 ? Because I want to 2 people that girls can be as important as boys. One important quality to be a president is self-discipline(自律). If your parents don't 3 your grades, will you work less hard 4 make yourself do more? I have always got A's since I 5 to Bedford, Massachusetts. The good 6 are a reward for my work. Another important quality is flexibility(灵活性). I have two sides. On the one hand, I'm 7 , but on the other hand, I'm tough(强硬的). I have to know when to be tough and when to be gentle. When a kid does 8 wrong, you need to be not only gentle but also tough. However, you 9 be tough when you are dealing with a bad man. These qualities will 10 me to my goal. I believe I will be the president when I grow up. | |||
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