"心理正常"意味着()。
A.包含精神病症状在内的心理活动
B.包含心理不正常在内的心理活动
C.一切可能的心理活动
D.具备正常功能的心理活动
参考答案:D
Questions 1-4
Why does the man think that he is not fit to be a road construction worker?()
A.He does not have the right digging tools.
B.He believes selling typewriters will make him rich.
C.He is not physically p enough.
D.He is dedicated to becoming a cleaner.
如图,空气(折射率n。一1)中波长为A的平行单色光,垂直入射在折射率为n1厚度为e的透明薄膜上,经薄膜上、下两个表面反射的两束光发生干涉。若薄膜下方媒质的折射率为n2,且n012,则两束反射光在相遇点的相位差为()。
A.4πn1e/λ
B.2πn1e/λ
C.4πn1n2e/λ
D.2πn1n2e/λ