RBBJ-T4便携式天然气泄漏检测仪的特点阐述错误的是()。
A、产品轻巧精致
B、携带方便
C、精确灵敏
D、维修方便
参考答案:D
将10.0 g含碳的铁合金放在氧气流里充分灼烧,得到0.185g二氧化碳,问此合金中碳的质量分数是多少?它是生铁还是钢?
根据句意,用所给动词的适当形式填空。
小题1:Lost in Thailand is a Chinese comedy______________(direct) by Xu Zheng.
小题2:—Is your father at home?
—No, I’m afraid he ____________(go) out.
小题3:Have you heard that some people ______________(send) to Mars in a few years?
小题4:This story tells us a lesson—the early bird _____________(catch) the worm.
小题5:Guo Chuan is the first Chinese ______________(realize) the dream of sailing around the world.