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If he ___________ on time, we will go without him.
1年前
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The teacher has told us something _____ we should do in the summer holiday.
1年前
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Traffic lights are very important for us.
1年前
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Rt△ABC中，∠C=90°，∠A=30°，AC=2cm，求直角边BC的长．
1年前
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托盘天平,量筒,烧杯,玻璃棒,药匙,漏斗,铁架台（带铁圈）,蒸发皿,酒精灯,坩埚钳,胶头滴管, 滤纸,剪刀,火柴,纸片，剪刀和胶头滴管是用来干嘛的？
1年前