下列制冷剂中液态比水轻的是()。
A.R12
B.R22
C.R134a
D.R717
参考答案:D
The supply chain activities encompass all associated with the flow and transaction of goods, the flow of information from the raw materials supplier to the end user, as well as the reverse flow of materials and in formation in the()
A.Distribution process
B.Supply chain
C.Enterprise
D.International community
在网络计划的执行过程中,若工作进度拖延,但拖延时间未超过其自由时差,则此进度偏差将()。
A.不影响总工期,影响后续工作的最早开始时间
B.不影响后续工作的最早开始时间,影响总工期
C.对总工期和后续工作的最早开始时间均无影响
D.对总工期和后续工作的最早开始时间均有影响