Which zone is a system-defined zone？（） A: null zone B: trust zone C: untrust zone D: management zone

In zone settling, sludge surface is between _____ . A: clean water zone and isoconcentration zone B: isoconcentration zone and transition zone C: transition zone and compression zone

The distance of the intimate zone is ________________, the personal zone is ____________, the casual zone is ___________, the public zone is _______________.

Wuzhou lies in _______. A: the tropical zone B: the cold-temperate zone C: the subtropical zone D: the temperate zone

The unsaturated zone (vadose zone) is the area above the zone of saturation.

Psychologists have identified four zones of interaction for Americans: the __________ zone, the __________ zone, the _______ zone, and the _______ zone.

As we know, college is a ( ). A: unique mix of future and stability B: universal mix of education and preparation C: unique mix of freedom and responsibility D: universal mix of success and confidence

298. 15K ， 标准大气压下， 物质量各为 1mol 的 A 和 B 形成理想溶液，试求Δ mix V，Δ mix H，Δ mix S，Δ mix G和Δ mix U的值各为多少。

According to gravity models, the number of trips produced in zone i and attracted to zone j depends on A: Total number of trips produced in zone i B: Total number of trips attracted to zone j C: Total number of trips produced in zone j D: Total number of trips attracted to zone i

Vygotsky refers to “the distance between the actual development level and the level of potential development” as ( ) A: zone of proximal learning B: zone of self-achievement C: zone of proximal development D: zone of scaffold learning