石膏的主要化学成分是()。
A: CaS04.H20
B: CaS04.2H20
C: CaS04
D: CaS04.10H20
A: CaS04.H20
B: CaS04.2H20
C: CaS04
D: CaS04.10H20
举一反三
- 第一行第一个CAS的H端的值是（）。
- CAS号，即CAS登记号（CAS Registry Number），是美国化学文摘服务社为化学物质制订的登记号，用来检索（ ）。
- Which of the following is the definition of CAS latency？（） A: CAS latency is the ratio between the column access time and the clock cycle time. B: CAS latency is the ratio between the row access time and the clock cycle time. C: CAS latency is the ratio between the column access time and the data burst transfer time. D: CAS latency is the ratio between the row access time and the data burst transfer time.
- CAS是（）运行方式。
- 10号线CAS服务器，启动cas_control.sh的目录是（） A: dbs/ATS B: cas/ATS C: adm/ATS D: home/ATS