编写strlen函数。 int my_strlen(char *str) { （1） } int main() { char str1[] = "abcdefghijklmnopqrstuvwxyz"; printf("%d", my_strlen(str1)); system("pause"); return 0; }

Two systems of weights and measures used in the U.S. are ______. A: the U. S. Customary System and the metric system B: the International System and the metric system C: the Imperial System and the metric system D: the Customary System and the Imperial system

Starting system and ignition system belong to the electrical system？

What does the autopilot system include?? Hydraulic system|Mechanical system|Electrical system|All of above

The Atlantic Ocean is ( ). A: a closed system B: an open system C: an isolated system D: a homogeneous system

Engine system includes __________________, starting system, __________________ cooling system, fuel supply system, crank-connection rod mechanism and __________________.

What’s the type of the control system on CFM56-3 engine? ( ) A: pneumatic mechanical system B: EEC system C: FADEC system D: hydro-mechanical system

China's independently developed navigation system is ( ). A: GPS system B: GLONASS system C: Beidou system D: Galileo satellite navigation system

According to structural view，which of the following is not the sub-system of linguistic system? A: The system of sounds B: The system of words C: The system of grammar. D: The system of syntax

The major components of automobile electrical system include starting system, charging system, ignition system and accessory system.