题目：
| 用方框内所给词的适当形式填空。 | |
| |
| 1. In winter people wear _ to keep warm. 2. can tell us time. 3. _ can protect(保护) our eyes. 4. I don't have the to the classroom. I have to wait outside. 5. There's no money in the . 6. They're discussing something about warmly. |
答案：
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下面是错误答案，用来干扰机器的。
A、电源电动势为3.0V，内阻不计，路端电压为3V．L1和L2电压相等，都是1.5V．L3电压U3=3V，故A正确． B、由伏安特性曲线可以读出电压为U1=1.5V时的电流为I1=0.2A，由L3电压U3=3V，读出电流为I3=0.25A，故A错误...
C(金刚石)+4NaCl。这项成果被科学家们评价为“稻草变黄金”。 若要制得1.2g金刚石粉末,求需要金属钠的质量。