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.

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

The shear failure zone of foundation assumed by Terzaghi theory is also divided into three zones, namely elastic zone, transition zone and passive zone.

The minimum hardness in the joint of a FSWed precipitation-hardened aluminum alloys lies in the （ ）. A: thermally affected zone B: thermomechanically affected zone C: dynamically recrystallized zone