A：避免盖玻片下面出现气泡
B：防止水溢出
C：增强透明度
D：防止实验材料被损坏
今我朝罢丞相，设五府、六部……等衙门，分理天下庶务（政务）”。这里“罢丞相”的皇帝是( )
下列生态系统中自动调节能力最强的是：
When he was unknown ________the young people, he served ________ a singer at a bar.
