题目内容
在我国分布较广，且对职业人群健康影响较大的生产性粉尘不包括选项()。
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应用指数平滑法预测的一个关键是修正常数。的取值。一般情况下，时间数列越平稳，α取值越小；时间数列波动越大，如呈阶梯式或按某种比率上升或下降，α取值越大，从而使得预测值能够敏感地跟踪实际值的变化。()
脑性痉挛性瘫痪
第二节 完型填空
阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选择能填入相应空白处的最佳选项。
How can we practice our spoken English？
The first and the most important thing is【16】yourself. You should always be full of【17】or you will【18】improve your English. You should often encourage yourself, "Come on, don't be afraid!" You should never lose heart and never give up.
Maybe you are afraid【19】losing face, but you should think that since we are students, we're learning, there is no need【20】about anything. You must always be active in practice. There is no problem if your pronunciation and intonation (语调) can't be【21】good as the native people because we are Chinese, and we don't have【22】to live in foreign countries and talk with the people there all the time. But you must know that the main way to study English is to make ourselves【23】and understand other people. You should believe that native speakers will not laugh【24】you, instead they will encourage you. So if you're【25】, you will certainly make a rapid progress in your spoken English.
(16)
关于相对比的计算公式,下列哪项是正确的
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