— What time shall we leave for the airport? — It's foggy today. I'm not sure __________ be closed soon. Let's go now.
A:whether the highway wil
B:whether will the highway
C:when the highway will
D:when will the highway
在“碳酸氢钠、干冰、碳酸钙、过磷酸钙、锰钢、酚醛塑料”中选择适当的物质填空:
(1)可用作磷肥的是____ ; (2)属于有机合成材料的是____ ;
(3)用作自行车支架的是____ ; (4)可用作致冷剂的是____ ;
(5)可用作制糕点的是____ ; (6)可用作补钙剂的是____ .