创立细胞学说的科学家是[ ]
A.达尔文
B.施莱登和施旺
C.虎克
D.列文虎克
答案:B
Luckily, the people there did ______ help him.
A.that they could
B.which they could to
C.what they could
D.what they could to
关于二氧化钛输送管线堵塞处理措施不正确的是()。
A、首先切换到备用泵,观察流量是否正常
B、若是公用管线堵塞用新鲜EG清洗
C、若流量计堵塞用新鲜EG冲洗
D、若处理不通,则从TiO2泵出口到添加剂喷嘴接皮带满足TiO2供应,不用作相应处理